161356378875 has 16 divisors (see below), whose sum is σ = 268497015072. Its totient is φ = 86056735200.

The previous prime is 161356378847. The next prime is 161356378901. The reversal of 161356378875 is 578873653161.

It is a happy number.

It is not a de Polignac number, because 161356378875 - 2¹⁷ = 161356247803 is a prime.

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, 215141464 + ... + 215142213.

It is an arithmetic number, because the mean of its divisors is an integer number (16781063442).

Almost surely, 2^161356378875 is an apocalyptic number.

161356378875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161356378875 is a deficient number, since it is larger than the sum of its proper divisors (107140636197).

161356378875 is an equidigital number, since it uses as much as digits as its factorization.

161356378875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430283695 (or 430283685 counting only the distinct ones).

The product of its digits is 25401600, while the sum is 60.

The spelling of 161356378875 in words is "one hundred sixty-one billion, three hundred fifty-six million, three hundred seventy-eight thousand, eight hundred seventy-five".