161651166626 has 8 divisors (see below), whose sum is σ = 242484898860. Its totient is φ = 80822867008.

The previous prime is 161651166617. The next prime is 161651166629. The reversal of 161651166626 is 626661156161.

It can be written as a sum of positive squares in 2 ways, for example, as 151477418401 + 10173748225 = 389201^2 + 100865^2 .

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

It is a super-2 number, since 2×161651166626² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161651166629) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1282931 + ... + 1403286.

Almost surely, 2^161651166626 is an apocalyptic number.

161651166626 is a deficient number, since it is larger than the sum of its proper divisors (80833732234).

161651166626 is a wasteful number, since it uses less digits than its factorization.

161651166626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2716308.

The product of its digits is 466560, while the sum is 47.

The spelling of 161651166626 in words is "one hundred sixty-one billion, six hundred fifty-one million, one hundred sixty-six thousand, six hundred twenty-six".