25345455491520 has 560 divisors, whose sum is σ = 96033575816640. Its totient is φ = 6323102908416.

The previous prime is 25345455491471. The next prime is 25345455491527. The reversal of 25345455491520 is 2519455454352.

25345455491520 is a `hidden beast` number, since 2 + 5 + 3 + 4 + 5 + 45 + 549 + 1 + 52 + 0 = 666.

It is a super-2 number, since 2×25345455491520² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25345455491527) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 73414666 + ... + 73759094.

It is an arithmetic number, because the mean of its divisors is an integer number (171488528244).

Almost surely, 2^{25345455491520} is an apocalyptic number.

25345455491520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25345455491520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48016787908320).

25345455491520 is an abundant number, since it is smaller than the sum of its proper divisors (70688120325120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25345455491520 is a wasteful number, since it uses less digits than its factorization.

25345455491520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344642 (or 344623 counting only the distinct ones).

The product of its (nonzero) digits is 21600000, while the sum is 54.

The spelling of 25345455491520 in words is "twenty-five trillion, three hundred forty-five billion, four hundred fifty-five million, four hundred ninety-one thousand, five hundred twenty".