25755557464 has 256 divisors, whose sum is σ = 66648960000. Its totient is φ = 9060968448.

The previous prime is 25755557437. The next prime is 25755557497. The reversal of 25755557464 is 46475555752.

It is a super-2 number, since 2×25755557464² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 67956427 + ... + 67956805.

It is an arithmetic number, because the mean of its divisors is an integer number (260347500).

Almost surely, 2^25755557464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25755557464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33324480000).

25755557464 is an abundant number, since it is smaller than the sum of its proper divisors (40893402536).

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

25755557464 is a wasteful number, since it uses less digits than its factorization.

25755557464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475 (or 437 counting only the distinct ones).

The product of its digits is 29400000, while the sum is 55.

The spelling of 25755557464 in words is "twenty-five billion, seven hundred fifty-five million, five hundred fifty-seven thousand, four hundred sixty-four".