25126656464 has 160 divisors (see below), whose sum is σ = 62622658560. Its totient is φ = 9501359616.

The previous prime is 25126656437. The next prime is 25126656469. The reversal of 25126656464 is 46465662152.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25126656469) 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, 2938307 + ... + 2946845.

It is an arithmetic number, because the mean of its divisors is an integer number (391391616).

Almost surely, 2^25126656464 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 25126656464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31311329280).

25126656464 is an abundant number, since it is smaller than the sum of its proper divisors (37496002096).

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

25126656464 is a wasteful number, since it uses less digits than its factorization.

25126656464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8657 (or 8651 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 47.

The spelling of 25126656464 in words is "twenty-five billion, one hundred twenty-six million, six hundred fifty-six thousand, four hundred sixty-four".