161645151520 has 48 divisors (see below), whose sum is σ = 382585025088. Its totient is φ = 64539820800.

The previous prime is 161645151487. The next prime is 161645151533. The reversal of 161645151520 is 25151546161.

It is a super-2 number, since 2×161645151520² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161645151520.

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, 835956 + ... + 1010995.

It is an arithmetic number, because the mean of its divisors is an integer number (7970521356).

Almost surely, 2^161645151520 is an apocalyptic number.

161645151520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161645151520 is an abundant number, since it is smaller than the sum of its proper divisors (220939873568).

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

161645151520 is a wasteful number, since it uses less digits than its factorization.

161645151520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847513 (or 1847505 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 37.

Adding to 161645151520 its reverse (25151546161), we get a palindrome (186796697681).

The spelling of 161645151520 in words is "one hundred sixty-one billion, six hundred forty-five million, one hundred fifty-one thousand, five hundred twenty".