25221650496 has 56 divisors (see below), whose sum is σ = 76265471040. Its totient is φ = 7206185472.

The previous prime is 25221650429. The next prime is 25221650507. The reversal of 25221650496 is 69405612252.

It is a tau number, because it is divible by the number of its divisors (56).

It is a super-2 number, since 2×25221650496² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9381711 + ... + 9384398.

Almost surely, 2^25221650496 is an apocalyptic number.

It is an amenable number.

25221650496 is an abundant number, since it is smaller than the sum of its proper divisors (51043820544).

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

25221650496 is a wasteful number, since it uses less digits than its factorization.

25221650496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18766131 (or 18766121 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 42.

The spelling of 25221650496 in words is "twenty-five billion, two hundred twenty-one million, six hundred fifty thousand, four hundred ninety-six".