161555386154 has 32 divisors (see below), whose sum is σ = 250321104000. Its totient is φ = 78171065280.

The previous prime is 161555386093. The next prime is 161555386189. The reversal of 161555386154 is 451683555161.

It is a super-2 number, since 2×161555386154² (a number of 23 digits) contains 22 as substring.

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, 1607372 + ... + 1704920.

It is an arithmetic number, because the mean of its divisors is an integer number (7822534500).

Almost surely, 2^161555386154 is an apocalyptic number.

161555386154 is a deficient number, since it is larger than the sum of its proper divisors (88765717846).

161555386154 is a wasteful number, since it uses less digits than its factorization.

161555386154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97838.

The product of its digits is 2160000, while the sum is 50.

The spelling of 161555386154 in words is "one hundred sixty-one billion, five hundred fifty-five million, three hundred eighty-six thousand, one hundred fifty-four".