68634157 has 2 divisors, whose sum is σ = 68634158. Its totient is φ = 68634156.

The previous prime is 68634133. The next prime is 68634199. The reversal of 68634157 is 75143686.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63186601 + 5447556 = 7949^2 + 2334^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68634157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (68634257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34317078 + 34317079.

It is an arithmetic number, because the mean of its divisors is an integer number (34317079).

Almost surely, 2^68634157 is an apocalyptic number.

It is an amenable number.

68634157 is a deficient number, since it is larger than the sum of its proper divisors (1).

68634157 is an equidigital number, since it uses as much as digits as its factorization.

68634157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 40.

The square root of 68634157 is about 8284.5734350056. The cubic root of 68634157 is about 409.4304147117.

It can be divided in two parts, 686 and 34157, that added together give a palindrome (34843).

The spelling of 68634157 in words is "sixty-eight million, six hundred thirty-four thousand, one hundred fifty-seven".