161522977894 has 8 divisors (see below), whose sum is σ = 242434679040. Its totient is φ = 80711418216.

The previous prime is 161522977879. The next prime is 161522978003. The reversal of 161522977894 is 498779225161.

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

It is a super-2 number, since 2×161522977894² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25031334 + ... + 25037785.

It is an arithmetic number, because the mean of its divisors is an integer number (30304334880).

Almost surely, 2^161522977894 is an apocalyptic number.

161522977894 is a deficient number, since it is larger than the sum of its proper divisors (80911701146).

161522977894 is a wasteful number, since it uses less digits than its factorization.

161522977894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50070734.

The product of its digits is 15240960, while the sum is 61.

The spelling of 161522977894 in words is "one hundred sixty-one billion, five hundred twenty-two million, nine hundred seventy-seven thousand, eight hundred ninety-four".