25540021151 has 4 divisors (see below), whose sum is σ = 25540356600. Its totient is φ = 25539685704.

The previous prime is 25540021147. The next prime is 25540021201. The reversal of 25540021151 is 15112004552.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 25540021151 - 2² = 25540021147 is a prime.

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 25540021151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25540021121) 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, 7505 + ... + 226133.

It is an arithmetic number, because the mean of its divisors is an integer number (6385089150).

Almost surely, 2^25540021151 is an apocalyptic number.

25540021151 is a deficient number, since it is larger than the sum of its proper divisors (335449).

25540021151 is a wasteful number, since it uses less digits than its factorization.

25540021151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335448.

The product of its (nonzero) digits is 2000, while the sum is 26.

The spelling of 25540021151 in words is "twenty-five billion, five hundred forty million, twenty-one thousand, one hundred fifty-one".