161213437252 has 18 divisors (see below), whose sum is σ = 328184497662. Its totient is φ = 69091473024.

The previous prime is 161213437249. The next prime is 161213437289. The reversal of 161213437252 is 252734312161.

It can be written as a sum of positive squares in only one way, i.e., 112135237956 + 49078199296 = 334866^2 + 221536^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 411258573 + ... + 411258964.

Almost surely, 2^161213437252 is an apocalyptic number.

It is an amenable number.

161213437252 is an abundant number, since it is smaller than the sum of its proper divisors (166971060410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161213437252 is a wasteful number, since it uses less digits than its factorization.

161213437252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822517555 (or 822517546 counting only the distinct ones).

The product of its digits is 60480, while the sum is 37.

The spelling of 161213437252 in words is "one hundred sixty-one billion, two hundred thirteen million, four hundred thirty-seven thousand, two hundred fifty-two".