161552577771 has 24 divisors (see below), whose sum is σ = 252968302496. Its totient is φ = 98758569600.

The previous prime is 161552577757. The next prime is 161552577793. The reversal of 161552577771 is 177775255161.

161552577771 is a `hidden beast` number, since 1 + 6 + 15 + 52 + 577 + 7 + 7 + 1 = 666.

It is not a de Polignac number, because 161552577771 - 2¹⁰ = 161552576747 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161552577721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4554490 + ... + 4589823.

Almost surely, 2^161552577771 is an apocalyptic number.

161552577771 is a deficient number, since it is larger than the sum of its proper divisors (91415724725).

161552577771 is a wasteful number, since it uses less digits than its factorization.

161552577771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9144483 (or 9144480 counting only the distinct ones).

The product of its digits is 3601500, while the sum is 54.

The spelling of 161552577771 in words is "one hundred sixty-one billion, five hundred fifty-two million, five hundred seventy-seven thousand, seven hundred seventy-one".