161045116261572 has 12 divisors (see below), whose sum is σ = 375771937943696. Its totient is φ = 53681705420520.

The previous prime is 161045116261541. The next prime is 161045116261583. The reversal of 161045116261572 is 275162611540161.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×161045116261572² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6710213177554 + ... + 6710213177577.

Almost surely, 2^{161045116261572} is an apocalyptic number.

161045116261572 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161045116261572 is an abundant number, since it is smaller than the sum of its proper divisors (214726821682124).

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

161045116261572 is a wasteful number, since it uses less digits than its factorization.

161045116261572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13420426355138 (or 13420426355136 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 48.

The spelling of 161045116261572 in words is "one hundred sixty-one trillion, forty-five billion, one hundred sixteen million, two hundred sixty-one thousand, five hundred seventy-two".