25643643343155 has 16 divisors (see below), whose sum is σ = 45588699276960. Its totient is φ = 13676609782944.

The previous prime is 25643643343141. The next prime is 25643643343163. The reversal of 25643643343155 is 55134334634652.

It is a happy number.

25643643343155 is a `hidden beast` number, since 2 + 5 + 64 + 364 + 33 + 43 + 155 = 666.

It is not a de Polignac number, because 25643643343155 - 2⁹ = 25643643342643 is a prime.

It is an unprimeable number.

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, 94976456692 + ... + 94976456961.

It is an arithmetic number, because the mean of its divisors is an integer number (2849293704810).

Almost surely, 2^{25643643343155} is an apocalyptic number.

25643643343155 is a deficient number, since it is larger than the sum of its proper divisors (19945055933805).

25643643343155 is a wasteful number, since it uses less digits than its factorization.

25643643343155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189952913667 (or 189952913661 counting only the distinct ones).

The product of its digits is 46656000, while the sum is 54.

The spelling of 25643643343155 in words is "twenty-five trillion, six hundred forty-three billion, six hundred forty-three million, three hundred forty-three thousand, one hundred fifty-five".