68099591677 has 18 divisors (see below), whose sum is σ = 73968569934. Its totient is φ = 62325282240.

The previous prime is 68099591663. The next prime is 68099591717. The reversal of 68099591677 is 77619599086.

It can be written as a sum of positive squares in 9 ways, for example, as 47275370041 + 20824221636 = 217429^2 + 144306^2 .

It is not a de Polignac number, because 68099591677 - 2¹⁹ = 68099067389 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 (68099591477) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 147721227 + ... + 147721687.

Almost surely, 2^68099591677 is an apocalyptic number.

It is an amenable number.

68099591677 is a deficient number, since it is larger than the sum of its proper divisors (5868978257).

68099591677 is an frugal number, since it uses more digits than its factorization.

68099591677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249 (or 631 counting only the distinct ones).

The product of its (nonzero) digits is 51438240, while the sum is 67.

The spelling of 68099591677 in words is "sixty-eight billion, ninety-nine million, five hundred ninety-one thousand, six hundred seventy-seven".