161702961813 has 12 divisors (see below), whose sum is σ = 233575669548. Its totient is φ = 107799793920.

The previous prime is 161702961733. The next prime is 161702961851. The reversal of 161702961813 is 318169207161.

161702961813 is a `hidden beast` number, since 1 + 6 + 1 + 7 + 0 + 29 + 618 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 43821979569 + 117880982244 = 209337^2 + 343338^2 .

It is not a de Polignac number, because 161702961813 - 2¹⁷ = 161702830741 is a prime.

It is a super-3 number, since 3×161702961813³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161702961883) 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, 378981 + ... + 683397.

It is an arithmetic number, because the mean of its divisors is an integer number (19464639129).

Almost surely, 2^161702961813 is an apocalyptic number.

It is an amenable number.

161702961813 is a deficient number, since it is larger than the sum of its proper divisors (71872707735).

161702961813 is a wasteful number, since it uses less digits than its factorization.

161702961813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363444 (or 363441 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The spelling of 161702961813 in words is "one hundred sixty-one billion, seven hundred two million, nine hundred sixty-one thousand, eight hundred thirteen".