161220471365 has 16 divisors (see below), whose sum is σ = 198466910208. Its totient is φ = 125666094336.

The previous prime is 161220471343. The next prime is 161220471421. The reversal of 161220471365 is 563174022161.

It is not a de Polignac number, because 161220471365 - 2⁶ = 161220471301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1485812 + ... + 1590621.

It is an arithmetic number, because the mean of its divisors is an integer number (12404181888).

Almost surely, 2^161220471365 is an apocalyptic number.

It is an amenable number.

161220471365 is a deficient number, since it is larger than the sum of its proper divisors (37246438843).

161220471365 is a wasteful number, since it uses less digits than its factorization.

161220471365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3076708.

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 161220471365 in words is "one hundred sixty-one billion, two hundred twenty million, four hundred seventy-one thousand, three hundred sixty-five".