161371742420 has 48 divisors (see below), whose sum is σ = 387894718848. Its totient is φ = 55241377920.

The previous prime is 161371742351. The next prime is 161371742443. The reversal of 161371742420 is 24247173161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 806291 + ... + 986330.

It is an arithmetic number, because the mean of its divisors is an integer number (8081139976).

Almost surely, 2^161371742420 is an apocalyptic number.

161371742420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161371742420 is an abundant number, since it is smaller than the sum of its proper divisors (226522976428).

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

161371742420 is a wasteful number, since it uses less digits than its factorization.

161371742420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793280 (or 1793278 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The spelling of 161371742420 in words is "one hundred sixty-one billion, three hundred seventy-one million, seven hundred forty-two thousand, four hundred twenty".