161601600515550 has 48 divisors (see below), whose sum is σ = 431600582305200. Its totient is φ = 39778855511040.

The previous prime is 161601600515527. The next prime is 161601600515557. The reversal of 161601600515550 is 55515006106161.

It is a super-2 number, since 2×161601600515550² (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 (161601600515557) 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, 41436305875 + ... + 41436309774.

It is an arithmetic number, because the mean of its divisors is an integer number (8991678798025).

Almost surely, 2^{161601600515550} is an apocalyptic number.

161601600515550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161601600515550 is an abundant number, since it is smaller than the sum of its proper divisors (269998981789650).

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

161601600515550 is a wasteful number, since it uses less digits than its factorization.

161601600515550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82872615677 (or 82872615672 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 42.

The spelling of 161601600515550 in words is "one hundred sixty-one trillion, six hundred one billion, six hundred million, five hundred fifteen thousand, five hundred fifty".