161935973406 has 24 divisors (see below), whose sum is σ = 350869831104. Its totient is φ = 53977341600.

The previous prime is 161935973401. The next prime is 161935973467. The reversal of 161935973406 is 604379539161.

161935973406 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 3 + 597 + 3 + 40 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161935973401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 900435 + ... + 1065201.

It is an arithmetic number, because the mean of its divisors is an integer number (14619576296).

Almost surely, 2^161935973406 is an apocalyptic number.

161935973406 is an abundant number, since it is smaller than the sum of its proper divisors (188933857698).

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

161935973406 is a wasteful number, since it uses less digits than its factorization.

161935973406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219376 (or 219373 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 54.

The spelling of 161935973406 in words is "one hundred sixty-one billion, nine hundred thirty-five million, nine hundred seventy-three thousand, four hundred six".