161358641331 has 8 divisors (see below), whose sum is σ = 218092045200. Its totient is φ = 106098832512.

The previous prime is 161358641321. The next prime is 161358641347. The reversal of 161358641331 is 133146853161.

It is a happy number.

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

It is not a de Polignac number, because 161358641331 - 2⁵ = 161358641299 is a prime.

It is a super-2 number, since 2×161358641331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161358641321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368398506 + ... + 368398943.

It is an arithmetic number, because the mean of its divisors is an integer number (27261505650).

Almost surely, 2^161358641331 is an apocalyptic number.

161358641331 is a deficient number, since it is larger than the sum of its proper divisors (56733403869).

161358641331 is an equidigital number, since it uses as much as digits as its factorization.

161358641331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 736797525.

The product of its digits is 155520, while the sum is 42.

The spelling of 161358641331 in words is "one hundred sixty-one billion, three hundred fifty-eight million, six hundred forty-one thousand, three hundred thirty-one".