68149653990 has 32 divisors (see below), whose sum is σ = 178428185856. Its totient is φ = 16521128160.

The previous prime is 68149653989. The next prime is 68149654019. The reversal of 68149653990 is 9935694186.

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, 103256722 + ... + 103257381.

It is an arithmetic number, because the mean of its divisors is an integer number (5575880808).

Almost surely, 2^68149653990 is an apocalyptic number.

68149653990 is an abundant number, since it is smaller than the sum of its proper divisors (110278531866).

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

68149653990 is a wasteful number, since it uses less digits than its factorization.

68149653990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206514124.

The product of its (nonzero) digits is 12597120, while the sum is 60.

The spelling of 68149653990 in words is "sixty-eight billion, one hundred forty-nine million, six hundred fifty-three thousand, nine hundred ninety".