166361563650465 has 12 divisors (see below), whose sum is σ = 288360043660884. Its totient is φ = 88726167280224.

The previous prime is 166361563650461. The next prime is 166361563650467. The reversal of 166361563650465 is 564056365163661.

166361563650465 is a `hidden beast` number, since 1 + 6 + 6 + 3 + 6 + 1 + 5 + 63 + 6 + 504 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30000990563856 + 136360573086609 = 5477316^2 + 11677353^2 .

It is not a de Polignac number, because 166361563650465 - 2² = 166361563650461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166361563650461) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1848461818294 + ... + 1848461818383.

It is an arithmetic number, because the mean of its divisors is an integer number (24030003638407).

Almost surely, 2^{166361563650465} is an apocalyptic number.

166361563650465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166361563650465 is a deficient number, since it is larger than the sum of its proper divisors (121998480010419).

166361563650465 is a wasteful number, since it uses less digits than its factorization.

166361563650465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3696923636688 (or 3696923636685 counting only the distinct ones).

The product of its (nonzero) digits is 209952000, while the sum is 63.

The spelling of 166361563650465 in words is "one hundred sixty-six trillion, three hundred sixty-one billion, five hundred sixty-three million, six hundred fifty thousand, four hundred sixty-five".