68108039949 has 4 divisors (see below), whose sum is σ = 90810719936. Its totient is φ = 45405359964.

The previous prime is 68108039893. The next prime is 68108039953. The reversal of 68108039949 is 94993080186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 68108039949 - 2¹³ = 68108031757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68108029949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11351339989 + ... + 11351339994.

It is an arithmetic number, because the mean of its divisors is an integer number (22702679984).

Almost surely, 2^68108039949 is an apocalyptic number.

It is an amenable number.

68108039949 is a deficient number, since it is larger than the sum of its proper divisors (22702679987).

68108039949 is a wasteful number, since it uses less digits than its factorization.

68108039949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22702679986.

The product of its (nonzero) digits is 3359232, while the sum is 57.

The spelling of 68108039949 in words is "sixty-eight billion, one hundred eight million, thirty-nine thousand, nine hundred forty-nine".