161477860241 has 4 divisors (see below), whose sum is σ = 165842126772. Its totient is φ = 157113593712.

The previous prime is 161477860211. The next prime is 161477860249. The reversal of 161477860241 is 142068774161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 109475618641 + 52002241600 = 330871^2 + 228040^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161477860241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161477860249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2182133210 + ... + 2182133283.

It is an arithmetic number, because the mean of its divisors is an integer number (41460531693).

Almost surely, 2^161477860241 is an apocalyptic number.

It is an amenable number.

161477860241 is a deficient number, since it is larger than the sum of its proper divisors (4364266531).

161477860241 is an equidigital number, since it uses as much as digits as its factorization.

161477860241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4364266530.

The product of its (nonzero) digits is 451584, while the sum is 47.

The spelling of 161477860241 in words is "one hundred sixty-one billion, four hundred seventy-seven million, eight hundred sixty thousand, two hundred forty-one".