16161630785540 has 24 divisors (see below), whose sum is σ = 33939500175000. Its totient is φ = 6464637928448.

The previous prime is 16161630785537. The next prime is 16161630785563. The reversal of 16161630785540 is 4558703616161.

It can be written as a sum of positive squares in 4 ways, for example, as 3056014437316 + 13105616348224 = 1748146^2 + 3620168^2 .

It is a super-2 number, since 2×16161630785540² (a number of 27 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 17166494 + ... + 18083466.

It is an arithmetic number, because the mean of its divisors is an integer number (1414145840625).

Almost surely, 2^{16161630785540} is an apocalyptic number.

16161630785540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16161630785540 is an abundant number, since it is smaller than the sum of its proper divisors (17777869389460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16161630785540 is a wasteful number, since it uses less digits than its factorization.

16161630785540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798231 (or 1798229 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 16161630785540 in words is "sixteen trillion, one hundred sixty-one billion, six hundred thirty million, seven hundred eighty-five thousand, five hundred forty".