20346665402465 has 16 divisors (see below), whose sum is σ = 24830036222400. Its totient is φ = 16001311768512.

The previous prime is 20346665402449. The next prime is 20346665402489. The reversal of 20346665402465 is 56420456664302.

It is a cyclic number.

It is not a de Polignac number, because 20346665402465 - 2⁴ = 20346665402449 is a prime.

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, 49948031 + ... + 50353739.

It is an arithmetic number, because the mean of its divisors is an integer number (1551877263900).

Almost surely, 2^{20346665402465} is an apocalyptic number.

It is an amenable number.

20346665402465 is a deficient number, since it is larger than the sum of its proper divisors (4483370819935).

20346665402465 is a wasteful number, since it uses less digits than its factorization.

20346665402465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 575776.

The product of its (nonzero) digits is 24883200, while the sum is 53.

The spelling of 20346665402465 in words is "twenty trillion, three hundred forty-six billion, six hundred sixty-five million, four hundred two thousand, four hundred sixty-five".