2161061400465 has 48 divisors (see below), whose sum is σ = 4163472031680. Its totient is φ = 1028017760640.

The previous prime is 2161061400461. The next prime is 2161061400481. The reversal of 2161061400465 is 5640041601612.

2161061400465 is a `hidden beast` number, since 21 + 6 + 10 + 614 + 0 + 0 + 4 + 6 + 5 = 666.

It is not a de Polignac number, because 2161061400465 - 2² = 2161061400461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2161061400461) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 41160375 + ... + 41212844.

It is an arithmetic number, because the mean of its divisors is an integer number (86739000660).

Almost surely, 2^{2161061400465} is an apocalyptic number.

It is an amenable number.

2161061400465 is a deficient number, since it is larger than the sum of its proper divisors (2002410631215).

2161061400465 is a wasteful number, since it uses less digits than its factorization.

2161061400465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82373294 (or 82373291 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 2161061400465 in words is "two trillion, one hundred sixty-one billion, sixty-one million, four hundred thousand, four hundred sixty-five".