161956959312 has 20 divisors (see below), whose sum is σ = 418388811680. Its totient is φ = 53985653088.

The previous prime is 161956959301. The next prime is 161956959317. The reversal of 161956959312 is 213959659161.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161956959317) 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, 1687051612 + ... + 1687051707.

It is an arithmetic number, because the mean of its divisors is an integer number (20919440584).

Almost surely, 2^161956959312 is an apocalyptic number.

161956959312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161956959312 is an abundant number, since it is smaller than the sum of its proper divisors (256431852368).

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

161956959312 is a wasteful number, since it uses less digits than its factorization.

161956959312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374103330 (or 3374103324 counting only the distinct ones).

The product of its digits is 3936600, while the sum is 57.

The spelling of 161956959312 in words is "one hundred sixty-one billion, nine hundred fifty-six million, nine hundred fifty-nine thousand, three hundred twelve".