68586020721 has 12 divisors (see below), whose sum is σ = 99075616848. Its totient is φ = 45720819864.

The previous prime is 68586020707. The next prime is 68586020729. The reversal of 68586020721 is 12702068586.

68586020721 is a `hidden beast` number, since 68 + 586 + 0 + 2 + 0 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 68586020721 - 2²³ = 68577632113 is a prime.

It is a super-3 number, since 3×68586020721³ (a number of 33 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68586020729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 126295 + ... + 391308.

It is an arithmetic number, because the mean of its divisors is an integer number (8256301404).

Almost surely, 2^68586020721 is an apocalyptic number.

It is an amenable number.

68586020721 is a deficient number, since it is larger than the sum of its proper divisors (30489596127).

68586020721 is a wasteful number, since it uses less digits than its factorization.

68586020721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532332 (or 532329 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 68586020721 in words is "sixty-eight billion, five hundred eighty-six million, twenty thousand, seven hundred twenty-one".