2161661425635 has 16 divisors (see below), whose sum is σ = 3539092195584. Its totient is φ = 1126074788832.

The previous prime is 2161661425607. The next prime is 2161661425643. The reversal of 2161661425635 is 5365241661612.

It is a happy number.

It is not a de Polignac number, because 2161661425635 - 2⁵ = 2161661425603 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, 1675705887 + ... + 1675707176.

It is an arithmetic number, because the mean of its divisors is an integer number (221193262224).

Almost surely, 2^{2161661425635} is an apocalyptic number.

2161661425635 is a deficient number, since it is larger than the sum of its proper divisors (1377430769949).

2161661425635 is a wasteful number, since it uses less digits than its factorization.

2161661425635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351413114.

The product of its digits is 1555200, while the sum is 48.

The spelling of 2161661425635 in words is "two trillion, one hundred sixty-one billion, six hundred sixty-one million, four hundred twenty-five thousand, six hundred thirty-five".