25520492712 has 128 divisors (see below), whose sum is σ = 75120514560. Its totient is φ = 7122865920.

The previous prime is 25520492707. The next prime is 25520492717. The reversal of 25520492712 is 21729402552.

It is an interprime number because it is at equal distance from previous prime (25520492707) and next prime (25520492717).

It is a super-2 number, since 2×25520492712² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (25520492717) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1594783 + ... + 1610705.

It is an arithmetic number, because the mean of its divisors is an integer number (586879020).

Almost surely, 2^25520492712 is an apocalyptic number.

25520492712 is a gapful number since it is divisible by the number (22) 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 25520492712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37560257280).

25520492712 is an abundant number, since it is smaller than the sum of its proper divisors (49600021848).

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

25520492712 is a wasteful number, since it uses less digits than its factorization.

25520492712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16423 (or 16419 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 39.

The spelling of 25520492712 in words is "twenty-five billion, five hundred twenty million, four hundred ninety-two thousand, seven hundred twelve".