161243904742 has 96 divisors (see below), whose sum is σ = 267372161280. Its totient is φ = 72767217600.

The previous prime is 161243904737. The next prime is 161243904751. The reversal of 161243904742 is 247409342161.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 550320348 + ... + 550320640.

It is an arithmetic number, because the mean of its divisors is an integer number (2785126680).

Almost surely, 2^161243904742 is an apocalyptic number.

161243904742 is a deficient number, since it is larger than the sum of its proper divisors (106128256538).

161243904742 is a wasteful number, since it uses less digits than its factorization.

161243904742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650 (or 619 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 161243904742 in words is "one hundred sixty-one billion, two hundred forty-three million, nine hundred four thousand, seven hundred forty-two".