161243645874 has 16 divisors (see below), whose sum is σ = 322633703712. Its totient is φ = 53723479968.

The previous prime is 161243645869. The next prime is 161243645879. The reversal of 161243645874 is 478546342161.

It is an interprime number because it is at equal distance from previous prime (161243645869) and next prime (161243645879).

It is not an unprimeable number, because it can be changed into a prime (161243645879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6086179 + ... + 6112614.

It is an arithmetic number, because the mean of its divisors is an integer number (20164606482).

Almost surely, 2^161243645874 is an apocalyptic number.

161243645874 is an abundant number, since it is smaller than the sum of its proper divisors (161390057838).

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

161243645874 is a wasteful number, since it uses less digits than its factorization.

161243645874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12201001.

The product of its digits is 3870720, while the sum is 51.

The spelling of 161243645874 in words is "one hundred sixty-one billion, two hundred forty-three million, six hundred forty-five thousand, eight hundred seventy-four".