68715157 has 4 divisors (see below), whose sum is σ = 78531616. Its totient is φ = 58898700.

The previous prime is 68715151. The next prime is 68715167. The reversal of 68715157 is 75151786.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75151786 = 2 ⋅37575893.

It is not a de Polignac number, because 68715157 - 2⁷ = 68715029 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 (68715151) 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, 4908219 + ... + 4908232.

It is an arithmetic number, because the mean of its divisors is an integer number (19632904).

Almost surely, 2^68715157 is an apocalyptic number.

It is an amenable number.

68715157 is a deficient number, since it is larger than the sum of its proper divisors (9816459).

68715157 is an equidigital number, since it uses as much as digits as its factorization.

68715157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9816458.

The product of its digits is 58800, while the sum is 40.

The square root of 68715157 is about 8289.4605976505. The cubic root of 68715157 is about 409.5914172758.

The spelling of 68715157 in words is "sixty-eight million, seven hundred fifteen thousand, one hundred fifty-seven".