161501775365 has 8 divisors (see below), whose sum is σ = 221488149120. Its totient is φ = 110744074512.

The previous prime is 161501775349. The next prime is 161501775371. The reversal of 161501775365 is 563577105161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161501775365 - 2⁴ = 161501775349 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2307168185 + ... + 2307168254.

It is an arithmetic number, because the mean of its divisors is an integer number (27686018640).

Almost surely, 2^161501775365 is an apocalyptic number.

It is an amenable number.

161501775365 is a deficient number, since it is larger than the sum of its proper divisors (59986373755).

161501775365 is an equidigital number, since it uses as much as digits as its factorization.

161501775365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4614336451.

The product of its (nonzero) digits is 661500, while the sum is 47.

The spelling of 161501775365 in words is "one hundred sixty-one billion, five hundred one million, seven hundred seventy-five thousand, three hundred sixty-five".