25216457168381 has 4 divisors (see below), whose sum is σ = 25216578204000. Its totient is φ = 25216336132764.

The previous prime is 25216457168369. The next prime is 25216457168387. The reversal of 25216457168381 is 18386175461252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25216457168381 - 2²⁶ = 25216390059517 is a prime.

It is a super-2 number, since 2×25216457168381² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25216457168381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25216457168387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60204761 + ... + 60622158.

It is an arithmetic number, because the mean of its divisors is an integer number (6304144551000).

Almost surely, 2^{25216457168381} is an apocalyptic number.

It is an amenable number.

25216457168381 is a deficient number, since it is larger than the sum of its proper divisors (121035619).

25216457168381 is a wasteful number, since it uses less digits than its factorization.

25216457168381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121035618.

The product of its digits is 19353600, while the sum is 59.

The spelling of 25216457168381 in words is "twenty-five trillion, two hundred sixteen billion, four hundred fifty-seven million, one hundred sixty-eight thousand, three hundred eighty-one".