161976878885 has 8 divisors (see below), whose sum is σ = 202823222400. Its totient is φ = 123947524624.

The previous prime is 161976878857. The next prime is 161976878887. The reversal of 161976878885 is 588878679161.

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

It is a cyclic number.

It is not a de Polignac number, because 161976878885 - 2⁸ = 161976878629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161976878887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 704247185 + ... + 704247414.

It is an arithmetic number, because the mean of its divisors is an integer number (25352902800).

Almost surely, 2^161976878885 is an apocalyptic number.

It is an amenable number.

161976878885 is a deficient number, since it is larger than the sum of its proper divisors (40846343515).

161976878885 is a wasteful number, since it uses less digits than its factorization.

161976878885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408494627.

The product of its digits is 325140480, while the sum is 74.

The spelling of 161976878885 in words is "one hundred sixty-one billion, nine hundred seventy-six million, eight hundred seventy-eight thousand, eight hundred eighty-five".