161247074978 has 8 divisors (see below), whose sum is σ = 263858850000. Its totient is φ = 73294124980.

The previous prime is 161247074977. The next prime is 161247075029. The reversal of 161247074978 is 879470742161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (161247074977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3664706228 + ... + 3664706271.

It is an arithmetic number, because the mean of its divisors is an integer number (32982356250).

Almost surely, 2^161247074978 is an apocalyptic number.

161247074978 is a deficient number, since it is larger than the sum of its proper divisors (102611775022).

161247074978 is a wasteful number, since it uses less digits than its factorization.

161247074978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7329412512.

The product of its (nonzero) digits is 4741632, while the sum is 56.

The spelling of 161247074978 in words is "one hundred sixty-one billion, two hundred forty-seven million, seventy-four thousand, nine hundred seventy-eight".