168581601 has 16 divisors (see below), whose sum is σ = 253174720. Its totient is φ = 110846880.

The previous prime is 168581597. The next prime is 168581617. The reversal of 168581601 is 106185861.

168581601 is a `hidden beast` number, since 16 + 8 + 581 + 60 + 1 = 666.

It is not a de Polignac number, because 168581601 - 2² = 168581597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168581641) 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, 40795 + ... + 44736.

It is an arithmetic number, because the mean of its divisors is an integer number (15823420).

Almost surely, 2^168581601 is an apocalyptic number.

It is an amenable number.

168581601 is a deficient number, since it is larger than the sum of its proper divisors (84593119).

168581601 is an equidigital number, since it uses as much as digits as its factorization.

168581601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85613 (or 85607 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 168581601 is about 12983.8977583775. The cubic root of 168581601 is about 552.4208451811.

The spelling of 168581601 in words is "one hundred sixty-eight million, five hundred eighty-one thousand, six hundred one".