68270636657 has 6 divisors (see below), whose sum is σ = 72052943778. Its totient is φ = 64677444912.

The previous prime is 68270636647. The next prime is 68270636663. The reversal of 68270636657 is 75663607286.

It can be written as a sum of positive squares in only one way, i.e., 68142403681 + 128232976 = 261041^2 + 11324^2 .

It is not a de Polignac number, because 68270636657 - 2⁶ = 68270636593 is a prime.

It is a super-2 number, since 2×68270636657² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68270636647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 94557308 + ... + 94558029.

It is an arithmetic number, because the mean of its divisors is an integer number (12008823963).

Almost surely, 2^68270636657 is an apocalyptic number.

It is an amenable number.

68270636657 is a deficient number, since it is larger than the sum of its proper divisors (3782307121).

68270636657 is a wasteful number, since it uses less digits than its factorization.

68270636657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189115375 (or 189115356 counting only the distinct ones).

The product of its (nonzero) digits is 15240960, while the sum is 56.

The spelling of 68270636657 in words is "sixty-eight billion, two hundred seventy million, six hundred thirty-six thousand, six hundred fifty-seven".