161005006655 has 16 divisors (see below), whose sum is σ = 194013895680. Its totient is φ = 128266003488.

The previous prime is 161005006627. The next prime is 161005006693. The reversal of 161005006655 is 556600500161.

It is a cyclic number.

It is not a de Polignac number, because 161005006655 - 2¹⁰ = 161005005631 is a prime.

It is a super-2 number, since 2×161005006655² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 2204006 + ... + 2275884.

It is an arithmetic number, because the mean of its divisors is an integer number (12125868480).

Almost surely, 2^161005006655 is an apocalyptic number.

161005006655 is a deficient number, since it is larger than the sum of its proper divisors (33008889025).

161005006655 is a wasteful number, since it uses less digits than its factorization.

161005006655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73750.

The product of its (nonzero) digits is 27000, while the sum is 35.

The spelling of 161005006655 in words is "one hundred sixty-one billion, five million, six thousand, six hundred fifty-five".