161577375122 has 4 divisors (see below), whose sum is σ = 242366062686. Its totient is φ = 80788687560.

The previous prime is 161577374999. The next prime is 161577375139. The reversal of 161577375122 is 221573775161.

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

It can be written as a sum of positive squares in only one way, i.e., 124763661961 + 36813713161 = 353219^2 + 191869^2 .

It is a super-2 number, since 2×161577375122² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40394343779 + ... + 40394343782.

Almost surely, 2^161577375122 is an apocalyptic number.

161577375122 is a deficient number, since it is larger than the sum of its proper divisors (80788687564).

161577375122 is an equidigital number, since it uses as much as digits as its factorization.

161577375122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80788687563.

The product of its digits is 617400, while the sum is 47.

The spelling of 161577375122 in words is "one hundred sixty-one billion, five hundred seventy-seven million, three hundred seventy-five thousand, one hundred twenty-two".