68647612257 has 24 divisors (see below), whose sum is σ = 115958466624. Its totient is φ = 38314944864.

The previous prime is 68647612249. The next prime is 68647612277. The reversal of 68647612257 is 75221674686.

It is a happy number.

It is not a de Polignac number, because 68647612257 - 2³ = 68647612249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68647612277) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12667578 + ... + 12672995.

It is an arithmetic number, because the mean of its divisors is an integer number (4831602776).

Almost surely, 2^68647612257 is an apocalyptic number.

It is an amenable number.

68647612257 is a deficient number, since it is larger than the sum of its proper divisors (47310854367).

68647612257 is a wasteful number, since it uses less digits than its factorization.

68647612257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25340629 (or 25340626 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The spelling of 68647612257 in words is "sixty-eight billion, six hundred forty-seven million, six hundred twelve thousand, two hundred fifty-seven".