25221464604 has 144 divisors (see below), whose sum is σ = 75579678720. Its totient is φ = 6938709120.

The previous prime is 25221464563. The next prime is 25221464647. The reversal of 25221464604 is 40646412252.

25221464604 is a `hidden beast` number, since 2 + 5 + 2 + 2 + 1 + 4 + 646 + 0 + 4 = 666.

It is a super-2 number, since 2×25221464604² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2794459 + ... + 2803469.

It is an arithmetic number, because the mean of its divisors is an integer number (524858880).

Almost surely, 2^25221464604 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 25221464604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37789839360).

25221464604 is an abundant number, since it is smaller than the sum of its proper divisors (50358214116).

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

25221464604 is a wasteful number, since it uses less digits than its factorization.

25221464604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9440 (or 9435 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

Adding to 25221464604 its reverse (40646412252), we get a palindrome (65867876856).

The spelling of 25221464604 in words is "twenty-five billion, two hundred twenty-one million, four hundred sixty-four thousand, six hundred four".