161574963821557 has 48 divisors (see below), whose sum is σ = 198073185942016. Its totient is φ = 130786177737600.

The previous prime is 161574963821521. The next prime is 161574963821573. The reversal of 161574963821557 is 755128369475161.

It is not a de Polignac number, because 161574963821557 - 2³⁹ = 161025208007669 is a prime.

It is a super-2 number, since 2×161574963821557² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161574963821857) 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, 9573703 + ... + 20366779.

Almost surely, 2^{161574963821557} is an apocalyptic number.

It is an amenable number.

161574963821557 is a deficient number, since it is larger than the sum of its proper divisors (36498222120459).

161574963821557 is a wasteful number, since it uses less digits than its factorization.

161574963821557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10793450 (or 10793439 counting only the distinct ones).

The product of its digits is 381024000, while the sum is 70.

The spelling of 161574963821557 in words is "one hundred sixty-one trillion, five hundred seventy-four billion, nine hundred sixty-three million, eight hundred twenty-one thousand, five hundred fifty-seven".