161914722078 has 64 divisors (see below), whose sum is σ = 329005006848. Its totient is φ = 53118154080.

The previous prime is 161914722071. The next prime is 161914722097. The reversal of 161914722078 is 870227419161.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161914722071) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43441851 + ... + 43445577.

It is an arithmetic number, because the mean of its divisors is an integer number (5140703232).

Almost surely, 2^161914722078 is an apocalyptic number.

161914722078 is an abundant number, since it is smaller than the sum of its proper divisors (167090284770).

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

161914722078 is a wasteful number, since it uses less digits than its factorization.

161914722078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4317.

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 161914722078 in words is "one hundred sixty-one billion, nine hundred fourteen million, seven hundred twenty-two thousand, seventy-eight".