25121198616 has 24 divisors (see below), whose sum is σ = 62804937780. Its totient is φ = 8373474048.

The previous prime is 25121198573. The next prime is 25121198647. The reversal of 25121198616 is 61689112152.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 760296 + ... + 792648.

Almost surely, 2^25121198616 is an apocalyptic number.

It is an amenable number.

25121198616 is an abundant number, since it is smaller than the sum of its proper divisors (37683739164).

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

25121198616 is an frugal number, since it uses more digits than its factorization.

25121198616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64715 (or 32358 counting only the distinct ones).

The product of its digits is 51840, while the sum is 42.

The spelling of 25121198616 in words is "twenty-five billion, one hundred twenty-one million, one hundred ninety-eight thousand, six hundred sixteen".