68721520431 has 8 divisors (see below), whose sum is σ = 91631749504. Its totient is φ = 45812819160.

The previous prime is 68721520421. The next prime is 68721520459. The reversal of 68721520431 is 13402512786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68721520431 - 2⁶ = 68721520367 is a prime.

It is a super-2 number, since 2×68721520431² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68721520431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68721520411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272515 + ... + 460116.

It is an arithmetic number, because the mean of its divisors is an integer number (11453968688).

Almost surely, 2^68721520431 is an apocalyptic number.

68721520431 is a deficient number, since it is larger than the sum of its proper divisors (22910229073).

68721520431 is a wasteful number, since it uses less digits than its factorization.

68721520431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763901.

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 68721520431 in words is "sixty-eight billion, seven hundred twenty-one million, five hundred twenty thousand, four hundred thirty-one".