161902926365 has 4 divisors (see below), whose sum is σ = 194283511644. Its totient is φ = 129522341088.

The previous prime is 161902926343. The next prime is 161902926373. The reversal of 161902926365 is 563629209161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 112598500249 + 49304426116 = 335557^2 + 222046^2 .

It is a cyclic number.

It is not a de Polignac number, because 161902926365 - 2¹⁸ = 161902664221 is a prime.

It is a super-2 number, since 2×161902926365² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16190292632 + ... + 16190292641.

It is an arithmetic number, because the mean of its divisors is an integer number (48570877911).

Almost surely, 2^161902926365 is an apocalyptic number.

It is an amenable number.

161902926365 is a deficient number, since it is larger than the sum of its proper divisors (32380585279).

161902926365 is an equidigital number, since it uses as much as digits as its factorization.

161902926365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32380585278.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The spelling of 161902926365 in words is "one hundred sixty-one billion, nine hundred two million, nine hundred twenty-six thousand, three hundred sixty-five".