168072742640 has 80 divisors (see below), whose sum is σ = 451369726560. Its totient is φ = 57522216960.

The previous prime is 168072742631. The next prime is 168072742727. The reversal of 168072742640 is 46247270861.

It is a tau number, because it is divible by the number of its divisors (80).

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, 5602445 + ... + 5632364.

It is an arithmetic number, because the mean of its divisors is an integer number (5642121582).

Almost surely, 2^168072742640 is an apocalyptic number.

168072742640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168072742640 is an abundant number, since it is smaller than the sum of its proper divisors (283296983920).

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

168072742640 is a wasteful number, since it uses less digits than its factorization.

168072742640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11234850 (or 11234844 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 47.

The spelling of 168072742640 in words is "one hundred sixty-eight billion, seventy-two million, seven hundred forty-two thousand, six hundred forty".