25220642634 has 96 divisors (see below), whose sum is σ = 60948179136. Its totient is φ = 7473058560.

The previous prime is 25220642611. The next prime is 25220642669. The reversal of 25220642634 is 43624602252.

25220642634 is a `hidden beast` number, since 2 + 5 + 2 + 2 + 0 + 642 + 6 + 3 + 4 = 666.

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, 1810504 + ... + 1824380.

It is an arithmetic number, because the mean of its divisors is an integer number (634876866).

Almost surely, 2^25220642634 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25220642634, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30474089568).

25220642634 is an abundant number, since it is smaller than the sum of its proper divisors (35727536502).

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

25220642634 is a wasteful number, since it uses less digits than its factorization.

25220642634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14100 (or 14097 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 36.

The spelling of 25220642634 in words is "twenty-five billion, two hundred twenty million, six hundred forty-two thousand, six hundred thirty-four".