161408901810 has 64 divisors (see below), whose sum is σ = 418375641600. Its totient is φ = 39617544960.

The previous prime is 161408901799. The next prime is 161408901827. The reversal of 161408901810 is 18109804161.

It is a super-2 number, since 2×161408901810² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

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 31 ways as a sum of consecutive naturals, for example, 456826 + ... + 729045.

It is an arithmetic number, because the mean of its divisors is an integer number (6537119400).

Almost surely, 2^161408901810 is an apocalyptic number.

161408901810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161408901810 is an abundant number, since it is smaller than the sum of its proper divisors (256966739790).

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

161408901810 is a wasteful number, since it uses less digits than its factorization.

161408901810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1186243.

The product of its (nonzero) digits is 13824, while the sum is 39.

The spelling of 161408901810 in words is "one hundred sixty-one billion, four hundred eight million, nine hundred one thousand, eight hundred ten".