25666667516 has 48 divisors (see below), whose sum is σ = 51727818240. Its totient is φ = 10915728960.

The previous prime is 25666667513. The next prime is 25666667519. The reversal of 25666667516 is 61576666652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25666667513) and next prime (25666667519).

It is a super-2 number, since 2×25666667516² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25666667513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2515946 + ... + 2526126.

It is an arithmetic number, because the mean of its divisors is an integer number (1077662880).

Almost surely, 2^25666667516 is an apocalyptic number.

It is an amenable number.

25666667516 is an abundant number, since it is smaller than the sum of its proper divisors (26061150724).

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

25666667516 is a wasteful number, since it uses less digits than its factorization.

25666667516 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10874 (or 10872 counting only the distinct ones).

The product of its digits is 16329600, while the sum is 56.

The spelling of 25666667516 in words is "twenty-five billion, six hundred sixty-six million, six hundred sixty-seven thousand, five hundred sixteen".