68512915 has 4 divisors (see below), whose sum is σ = 82215504. Its totient is φ = 54810328.

The previous prime is 68512901. The next prime is 68512921. The reversal of 68512915 is 51921586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51921586 = 2 ⋅25960793.

It is a cyclic number.

It is not a de Polignac number, because 68512915 - 2¹⁷ = 68381843 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6851287 + ... + 6851296.

It is an arithmetic number, because the mean of its divisors is an integer number (20553876).

Almost surely, 2^68512915 is an apocalyptic number.

68512915 is a deficient number, since it is larger than the sum of its proper divisors (13702589).

68512915 is a wasteful number, since it uses less digits than its factorization.

68512915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13702588.

The product of its digits is 21600, while the sum is 37.

The square root of 68512915 is about 8277.2528655346. The cubic root of 68512915 is about 409.1891868112.

The spelling of 68512915 in words is "sixty-eight million, five hundred twelve thousand, nine hundred fifteen".