161481575767608 has 64 divisors (see below), whose sum is σ = 474945811092000. Its totient is φ = 50660886514176.

The previous prime is 161481575767579. The next prime is 161481575767609. The reversal of 161481575767608 is 806767575184161.

161481575767608 is a `hidden beast` number, since 1 + 6 + 1 + 4 + 8 + 1 + 5 + 7 + 5 + 7 + 6 + 7 + 608 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161481575767609) 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, 21988228323 + ... + 21988235666.

Almost surely, 2^{161481575767608} is an apocalyptic number.

161481575767608 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

161481575767608 is an abundant number, since it is smaller than the sum of its proper divisors (313464235324392).

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

161481575767608 is a wasteful number, since it uses less digits than its factorization.

161481575767608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43976464021 (or 43976464011 counting only the distinct ones).

The product of its (nonzero) digits is 474163200, while the sum is 72.

The spelling of 161481575767608 in words is "one hundred sixty-one trillion, four hundred eighty-one billion, five hundred seventy-five million, seven hundred sixty-seven thousand, six hundred eight".