161315760780 has 72 divisors (see below), whose sum is σ = 490263961824. Its totient is φ = 42934944000.

The previous prime is 161315760733. The next prime is 161315760787. The reversal of 161315760780 is 87067513161.

161315760780 is a `hidden beast` number, since 1 + 6 + 1 + 3 + 1 + 576 + 0 + 78 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (161315760787) 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, 766296 + ... + 953855.

It is an arithmetic number, because the mean of its divisors is an integer number (6809221692).

Almost surely, 2^161315760780 is an apocalyptic number.

161315760780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161315760780 is an abundant number, since it is smaller than the sum of its proper divisors (328948201044).

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

161315760780 is a wasteful number, since it uses less digits than its factorization.

161315760780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720687 (or 1720682 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The spelling of 161315760780 in words is "one hundred sixty-one billion, three hundred fifteen million, seven hundred sixty thousand, seven hundred eighty".