68403991885 has 16 divisors (see below), whose sum is σ = 83517891840. Its totient is φ = 53774360640.

The previous prime is 68403991879. The next prime is 68403991891. The reversal of 68403991885 is 58819930486.

It is an interprime number because it is at equal distance from previous prime (68403991879) and next prime (68403991891).

It is not a de Polignac number, because 68403991885 - 2³³ = 59814057293 is a prime.

It is a super-2 number, since 2×68403991885² (a number of 22 digits) contains 22 as substring.

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, 327022 + ... + 493711.

It is an arithmetic number, because the mean of its divisors is an integer number (5219868240).

Almost surely, 2^68403991885 is an apocalyptic number.

It is an amenable number.

68403991885 is a deficient number, since it is larger than the sum of its proper divisors (15113899955).

68403991885 is a wasteful number, since it uses less digits than its factorization.

68403991885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821028.

The product of its (nonzero) digits is 14929920, while the sum is 61.

The spelling of 68403991885 in words is "sixty-eight billion, four hundred three million, nine hundred ninety-one thousand, eight hundred eighty-five".