25340432665 has 16 divisors (see below), whose sum is σ = 30542738688. Its totient is φ = 20182962496.

The previous prime is 25340432647. The next prime is 25340432687. The reversal of 25340432665 is 56623404352.

It is a cyclic number.

It is not a de Polignac number, because 25340432665 - 2⁹ = 25340432153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2589612 + ... + 2599378.

It is an arithmetic number, because the mean of its divisors is an integer number (1908921168).

Almost surely, 2^25340432665 is an apocalyptic number.

It is an amenable number.

25340432665 is a deficient number, since it is larger than the sum of its proper divisors (5202306023).

25340432665 is a wasteful number, since it uses less digits than its factorization.

25340432665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12008.

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

The spelling of 25340432665 in words is "twenty-five billion, three hundred forty million, four hundred thirty-two thousand, six hundred sixty-five".