2161056412465 has 16 divisors (see below), whose sum is σ = 2725486243200. Its totient is φ = 1641780974592.

The previous prime is 2161056412451. The next prime is 2161056412469. The reversal of 2161056412465 is 5642146501612.

It is a de Polignac number, because none of the positive numbers 2^k-2161056412465 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2161056412469) 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, 67580400 + ... + 67612369.

It is an arithmetic number, because the mean of its divisors is an integer number (170342890200).

Almost surely, 2^{2161056412465} is an apocalyptic number.

It is an amenable number.

2161056412465 is a deficient number, since it is larger than the sum of its proper divisors (564429830735).

2161056412465 is a wasteful number, since it uses less digits than its factorization.

2161056412465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135192936.

The product of its (nonzero) digits is 345600, while the sum is 43.

The spelling of 2161056412465 in words is "two trillion, one hundred sixty-one billion, fifty-six million, four hundred twelve thousand, four hundred sixty-five".