68521697 has 4 divisors (see below), whose sum is σ = 68742336. Its totient is φ = 68301060.

The previous prime is 68521681. The next prime is 68521699. The reversal of 68521697 is 79612586.

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.

It is a cyclic number.

It is not a de Polignac number, because 68521697 - 2⁴ = 68521681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68521699) 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, 109853 + ... + 110474.

It is an arithmetic number, because the mean of its divisors is an integer number (17185584).

Almost surely, 2^68521697 is an apocalyptic number.

It is an amenable number.

68521697 is a deficient number, since it is larger than the sum of its proper divisors (220639).

68521697 is a wasteful number, since it uses less digits than its factorization.

68521697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220638.

The product of its digits is 181440, while the sum is 44.

The square root of 68521697 is about 8277.7833385515. The cubic root of 68521697 is about 409.2066693832.

The spelling of 68521697 in words is "sixty-eight million, five hundred twenty-one thousand, six hundred ninety-seven".