161065776774 has 64 divisors (see below), whose sum is σ = 398000448000. Its totient is φ = 42418453248.

The previous prime is 161065776763. The next prime is 161065776853. The reversal of 161065776774 is 477677560161.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2697999 + ... + 2757050.

It is an arithmetic number, because the mean of its divisors is an integer number (6218757000).

Almost surely, 2^161065776774 is an apocalyptic number.

161065776774 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

161065776774 is an abundant number, since it is smaller than the sum of its proper divisors (236934671226).

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

161065776774 is a wasteful number, since it uses less digits than its factorization.

161065776774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5455117.

The product of its (nonzero) digits is 10372320, while the sum is 57.

The spelling of 161065776774 in words is "one hundred sixty-one billion, sixty-five million, seven hundred seventy-six thousand, seven hundred seventy-four".