161210542220645 has 48 divisors (see below), whose sum is σ = 202144441000320. Its totient is φ = 123412396117248.

The previous prime is 161210542220603. The next prime is 161210542220789. The reversal of 161210542220645 is 546022245012161.

It is not a de Polignac number, because 161210542220645 - 2⁸ = 161210542220389 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 245736407 + ... + 246391563.

It is an arithmetic number, because the mean of its divisors is an integer number (4211342520840).

Almost surely, 2^{161210542220645} is an apocalyptic number.

It is an amenable number.

161210542220645 is a deficient number, since it is larger than the sum of its proper divisors (40933898779675).

161210542220645 is a wasteful number, since it uses less digits than its factorization.

161210542220645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655742 (or 655713 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 161210542220645 in words is "one hundred sixty-one trillion, two hundred ten billion, five hundred forty-two million, two hundred twenty thousand, six hundred forty-five".