161639494339 has 16 divisors (see below), whose sum is σ = 163953377280. Its totient is φ = 159342583680.

The previous prime is 161639494327. The next prime is 161639494351. The reversal of 161639494339 is 933494936161.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (161639494327) and next prime (161639494351).

It is not a de Polignac number, because 161639494339 - 2⁵ = 161639494307 is a prime.

It is a super-2 number, since 2×161639494339² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161639494739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31573822 + ... + 31578940.

It is an arithmetic number, because the mean of its divisors is an integer number (10247086080).

Almost surely, 2^161639494339 is an apocalyptic number.

161639494339 is a deficient number, since it is larger than the sum of its proper divisors (2313882941).

161639494339 is a wasteful number, since it uses less digits than its factorization.

161639494339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6690.

The product of its digits is 11337408, while the sum is 58.

The spelling of 161639494339 in words is "one hundred sixty-one billion, six hundred thirty-nine million, four hundred ninety-four thousand, three hundred thirty-nine".