68653997 has 4 divisors (see below), whose sum is σ = 68678556. Its totient is φ = 68629440.

The previous prime is 68653987. The next prime is 68654009. The reversal of 68653997 is 79935686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 79935686 = 2 ⋅39967843.

It can be written as a sum of positive squares in 2 ways, for example, as 66113161 + 2540836 = 8131^2 + 1594^2 .

It is a cyclic number.

It is not a de Polignac number, because 68653997 - 2¹⁸ = 68391853 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 (68653927) 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, 7454 + ... + 13887.

It is an arithmetic number, because the mean of its divisors is an integer number (17169639).

Almost surely, 2^68653997 is an apocalyptic number.

It is an amenable number.

68653997 is a deficient number, since it is larger than the sum of its proper divisors (24559).

68653997 is a wasteful number, since it uses less digits than its factorization.

68653997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24558.

The product of its digits is 2449440, while the sum is 53.

The square root of 68653997 is about 8285.7707547337. The cubic root of 68653997 is about 409.4698621102.

The spelling of 68653997 in words is "sixty-eight million, six hundred fifty-three thousand, nine hundred ninety-seven".