161935973397 has 48 divisors (see below), whose sum is σ = 258285800448. Its totient is φ = 96952602240.

The previous prime is 161935973393. The next prime is 161935973399. The reversal of 161935973397 is 793379539161.

161935973397 is a `hidden beast` number, since 1 + 6 + 1 + 9 + 3 + 597 + 3 + 39 + 7 = 666.

It is not a de Polignac number, because 161935973397 - 2² = 161935973393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161935973393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2658828 + ... + 2719050.

It is an arithmetic number, because the mean of its divisors is an integer number (5380954176).

Almost surely, 2^161935973397 is an apocalyptic number.

It is an amenable number.

161935973397 is a deficient number, since it is larger than the sum of its proper divisors (96349827051).

161935973397 is a wasteful number, since it uses less digits than its factorization.

161935973397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60570 (or 60567 counting only the distinct ones).

The product of its digits is 28934010, while the sum is 63.

The spelling of 161935973397 in words is "one hundred sixty-one billion, nine hundred thirty-five million, nine hundred seventy-three thousand, three hundred ninety-seven".