161264668490 has 64 divisors (see below), whose sum is σ = 312705798048. Its totient is φ = 59655782400.

The previous prime is 161264668483. The next prime is 161264668493. The reversal of 161264668490 is 94866462161.

161264668490 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 16 ways, for example, as 52581700249 + 108682968241 = 229307^2 + 329671^2 .

It is a Smith number, since the sum of its digits (53) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (161264668493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10995242 + ... + 11009898.

Almost surely, 2^161264668490 is an apocalyptic number.

161264668490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161264668490 is a deficient number, since it is larger than the sum of its proper divisors (151441129558).

161264668490 is a wasteful number, since it uses less digits than its factorization.

161264668490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15803.

The product of its (nonzero) digits is 2985984, while the sum is 53.

The spelling of 161264668490 in words is "one hundred sixty-one billion, two hundred sixty-four million, six hundred sixty-eight thousand, four hundred ninety".