161858195380 has 24 divisors (see below), whose sum is σ = 388459669248. Its totient is φ = 55494238368.

The previous prime is 161858195351. The next prime is 161858195431. The reversal of 161858195380 is 83591858161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 578064844 + ... + 578065123.

It is an arithmetic number, because the mean of its divisors is an integer number (16185819552).

Almost surely, 2^161858195380 is an apocalyptic number.

161858195380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161858195380 is an abundant number, since it is smaller than the sum of its proper divisors (226601473868).

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

161858195380 is a wasteful number, since it uses less digits than its factorization.

161858195380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156129983 (or 1156129981 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 55.

The spelling of 161858195380 in words is "one hundred sixty-one billion, eight hundred fifty-eight million, one hundred ninety-five thousand, three hundred eighty".