168646731604 has 24 divisors (see below), whose sum is σ = 324596659968. Its totient is φ = 76180846560.

The previous prime is 168646731577. The next prime is 168646731613. The reversal of 168646731604 is 406137646861.

It is a super-2 number, since 2×168646731604² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

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, 34499752 + ... + 34504639.

It is an arithmetic number, because the mean of its divisors is an integer number (13524860832).

Almost surely, 2^168646731604 is an apocalyptic number.

It is an amenable number.

168646731604 is a deficient number, since it is larger than the sum of its proper divisors (155949928364).

168646731604 is a wasteful number, since it uses less digits than its factorization.

168646731604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69004455 (or 69004453 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 52.

The spelling of 168646731604 in words is "one hundred sixty-eight billion, six hundred forty-six million, seven hundred thirty-one thousand, six hundred four".