25665434023 has 16 divisors (see below), whose sum is σ = 27792145120. Its totient is φ = 23618480256.

The previous prime is 25665434017. The next prime is 25665434071. The reversal of 25665434023 is 32043456652.

It is a cyclic number.

It is not a de Polignac number, because 25665434023 - 2²¹ = 25663336871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25665434083) 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, 401161 + ... + 460717.

It is an arithmetic number, because the mean of its divisors is an integer number (1737009070).

Almost surely, 2^25665434023 is an apocalyptic number.

25665434023 is a deficient number, since it is larger than the sum of its proper divisors (2126711097).

25665434023 is a wasteful number, since it uses less digits than its factorization.

25665434023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60226.

The product of its (nonzero) digits is 518400, while the sum is 40.

The spelling of 25665434023 in words is "twenty-five billion, six hundred sixty-five million, four hundred thirty-four thousand, twenty-three".