25664722464 has 96 divisors (see below), whose sum is σ = 68802048000. Its totient is φ = 8374279424.

The previous prime is 25664722429. The next prime is 25664722529. The reversal of 25664722464 is 46422746652.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1344217 + ... + 1363175.

It is an arithmetic number, because the mean of its divisors is an integer number (716688000).

Almost surely, 2^25664722464 is an apocalyptic number.

25664722464 is a gapful number since it is divisible by the number (24) 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 25664722464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34401024000).

25664722464 is an abundant number, since it is smaller than the sum of its proper divisors (43137325536).

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

25664722464 is a wasteful number, since it uses less digits than its factorization.

25664722464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19270 (or 19262 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 48.

The spelling of 25664722464 in words is "twenty-five billion, six hundred sixty-four million, seven hundred twenty-two thousand, four hundred sixty-four".