161154291620 has 48 divisors (see below), whose sum is σ = 386901567360. Its totient is φ = 55234147584.

The previous prime is 161154291611. The next prime is 161154291629. The reversal of 161154291620 is 26192451161.

It is an interprime number because it is at equal distance from previous prime (161154291611) and next prime (161154291629).

It is not an unprimeable number, because it can be changed into a prime (161154291629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 221807 + ... + 609513.

It is an arithmetic number, because the mean of its divisors is an integer number (8060449320).

Almost surely, 2^161154291620 is an apocalyptic number.

161154291620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161154291620 is an abundant number, since it is smaller than the sum of its proper divisors (225747275740).

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

161154291620 is a wasteful number, since it uses less digits than its factorization.

161154291620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390692 (or 390690 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 161154291620 in words is "one hundred sixty-one billion, one hundred fifty-four million, two hundred ninety-one thousand, six hundred twenty".