161606381794808 has 32 divisors (see below), whose sum is σ = 319572171450000. Its totient is φ = 76403461605120.

The previous prime is 161606381794807. The next prime is 161606381794813. The reversal of 161606381794808 is 808497183606161.

It is a super-2 number, since 2×161606381794808² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161606381794807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1020266183 + ... + 1020424566.

Almost surely, 2^{161606381794808} is an apocalyptic number.

It is an amenable number.

161606381794808 is a deficient number, since it is larger than the sum of its proper divisors (157965789655192).

161606381794808 is a wasteful number, since it uses less digits than its factorization.

161606381794808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2040691295 (or 2040691291 counting only the distinct ones).

The product of its (nonzero) digits is 83607552, while the sum is 68.

The spelling of 161606381794808 in words is "one hundred sixty-one trillion, six hundred six billion, three hundred eighty-one million, seven hundred ninety-four thousand, eight hundred eight".