161431830515044 has 6 divisors (see below), whose sum is σ = 282505703401334. Its totient is φ = 80715915257520.

The previous prime is 161431830515003. The next prime is 161431830515051. The reversal of 161431830515044 is 440515038134161.

It can be written as a sum of positive squares in only one way, i.e., 150207575046400 + 11224255468644 = 12255920^2 + 3350262^2 .

It is a junction number, because it is equal to n+sod(n) for n = 161431830514985 and 161431830515003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20178978814377 + ... + 20178978814384.

Almost surely, 2^{161431830515044} is an apocalyptic number.

It is an amenable number.

161431830515044 is a deficient number, since it is larger than the sum of its proper divisors (121073872886290).

161431830515044 is a wasteful number, since it uses less digits than its factorization.

161431830515044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40357957628765 (or 40357957628763 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 46.

The spelling of 161431830515044 in words is "one hundred sixty-one trillion, four hundred thirty-one billion, eight hundred thirty million, five hundred fifteen thousand, forty-four".