161558257760 has 48 divisors (see below), whose sum is σ = 387378146736. Its totient is φ = 63658771968.

The previous prime is 161558257717. The next prime is 161558257789. The reversal of 161558257760 is 67752855161.

It is a super-2 number, since 2×161558257760² (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 7 ways as a sum of consecutive naturals, for example, 7524647 + ... + 7546086.

It is an arithmetic number, because the mean of its divisors is an integer number (8070378057).

Almost surely, 2^161558257760 is an apocalyptic number.

161558257760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161558257760 is an abundant number, since it is smaller than the sum of its proper divisors (225819888976).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161558257760 is a wasteful number, since it uses less digits than its factorization.

161558257760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15070815 (or 15070807 counting only the distinct ones).

The product of its (nonzero) digits is 3528000, while the sum is 53.

The spelling of 161558257760 in words is "one hundred sixty-one billion, five hundred fifty-eight million, two hundred fifty-seven thousand, seven hundred sixty".