64691453 has 2 divisors, whose sum is σ = 64691454. Its totient is φ = 64691452.

The previous prime is 64691449. The next prime is 64691461. The reversal of 64691453 is 35419646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64673764 + 17689 = 8042^2 + 133^2 .

It is a cyclic number.

It is not a de Polignac number, because 64691453 - 2² = 64691449 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64691413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32345726 + 32345727.

It is an arithmetic number, because the mean of its divisors is an integer number (32345727).

Almost surely, 2^64691453 is an apocalyptic number.

It is an amenable number.

64691453 is a deficient number, since it is larger than the sum of its proper divisors (1).

64691453 is an equidigital number, since it uses as much as digits as its factorization.

64691453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 64691453 is about 8043.0997134190. The cubic root of 64691453 is about 401.4353702033.

The spelling of 64691453 in words is "sixty-four million, six hundred ninety-one thousand, four hundred fifty-three".