25611504402 has 16 divisors (see below), whose sum is σ = 55879646112. Its totient is φ = 7761061920.

The previous prime is 25611504379. The next prime is 25611504409. The reversal of 25611504402 is 20440511652.

It is a self number, because there is not a number n which added to its sum of digits gives 25611504402.

It is not an unprimeable number, because it can be changed into a prime (25611504409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 194026483 + ... + 194026614.

It is an arithmetic number, because the mean of its divisors is an integer number (3492477882).

Almost surely, 2^25611504402 is an apocalyptic number.

25611504402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25611504402 is an abundant number, since it is smaller than the sum of its proper divisors (30268141710).

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

25611504402 is a wasteful number, since it uses less digits than its factorization.

25611504402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388053113.

The product of its (nonzero) digits is 9600, while the sum is 30.

The spelling of 25611504402 in words is "twenty-five billion, six hundred eleven million, five hundred four thousand, four hundred two".