25861307516 has 48 divisors (see below), whose sum is σ = 49991891040. Its totient is φ = 11608350720.

The previous prime is 25861307513. The next prime is 25861307533. The reversal of 25861307516 is 61570316852.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25861307513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1152290 + ... + 1174518.

It is an arithmetic number, because the mean of its divisors is an integer number (1041497730).

Almost surely, 2^25861307516 is an apocalyptic number.

It is an amenable number.

25861307516 is a deficient number, since it is larger than the sum of its proper divisors (24130583524).

25861307516 is a wasteful number, since it uses less digits than its factorization.

25861307516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22574 (or 22572 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 25861307516 in words is "twenty-five billion, eight hundred sixty-one million, three hundred seven thousand, five hundred sixteen".