161646501285 has 16 divisors (see below), whose sum is σ = 287371558080. Its totient is φ = 86211467280.

The previous prime is 161646501259. The next prime is 161646501307. The reversal of 161646501285 is 582105646161.

161646501285 is a `hidden beast` number, since 1 + 6 + 1 + 64 + 6 + 501 + 2 + 85 = 666.

It is not a de Polignac number, because 161646501285 - 2¹⁹ = 161645976997 is a prime.

It is a super-2 number, since 2×161646501285² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 161646501285.

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, 598690611 + ... + 598690880.

It is an arithmetic number, because the mean of its divisors is an integer number (17960722380).

Almost surely, 2^161646501285 is an apocalyptic number.

161646501285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161646501285 is a deficient number, since it is larger than the sum of its proper divisors (125725056795).

161646501285 is a wasteful number, since it uses less digits than its factorization.

161646501285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1197381505 (or 1197381499 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 161646501285 in words is "one hundred sixty-one billion, six hundred forty-six million, five hundred one thousand, two hundred eighty-five".