68987920745 has 16 divisors (see below), whose sum is σ = 91466340480. Its totient is φ = 49685416704.

The previous prime is 68987920723. The next prime is 68987920789. The reversal of 68987920745 is 54702978986.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 68987920745 - 2⁶ = 68987920681 is a prime.

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, 17642015 + ... + 17645924.

It is an arithmetic number, because the mean of its divisors is an integer number (5716646280).

Almost surely, 2^68987920745 is an apocalyptic number.

It is an amenable number.

68987920745 is a deficient number, since it is larger than the sum of its proper divisors (22478419735).

68987920745 is a wasteful number, since it uses less digits than its factorization.

68987920745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35287984.

The product of its (nonzero) digits is 60963840, while the sum is 65.

The spelling of 68987920745 in words is "sixty-eight billion, nine hundred eighty-seven million, nine hundred twenty thousand, seven hundred forty-five".