65812993 has 2 divisors, whose sum is σ = 65812994. Its totient is φ = 65812992.

The previous prime is 65812991. The next prime is 65813039. The reversal of 65812993 is 39921856.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38229489 + 27583504 = 6183^2 + 5252^2 .

It is a cyclic number.

It is not a de Polignac number, because 65812993 - 2¹ = 65812991 is a prime.

Together with 65812991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (65812991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32906496 + 32906497.

It is an arithmetic number, because the mean of its divisors is an integer number (32906497).

Almost surely, 2^65812993 is an apocalyptic number.

It is an amenable number.

65812993 is a deficient number, since it is larger than the sum of its proper divisors (1).

65812993 is an equidigital number, since it uses as much as digits as its factorization.

65812993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 43.

The square root of 65812993 is about 8112.5207549812. The cubic root of 65812993 is about 403.7419540422.

The spelling of 65812993 in words is "sixty-five million, eight hundred twelve thousand, nine hundred ninety-three".