65612021507 has 2 divisors, whose sum is σ = 65612021508. Its totient is φ = 65612021506.

The previous prime is 65612021477. The next prime is 65612021533. The reversal of 65612021507 is 70512021656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65612021507 - 2²⁴ = 65595244291 is a prime.

It is not a weakly prime, because it can be changed into another prime (65612021807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32806010753 + 32806010754.

It is an arithmetic number, because the mean of its divisors is an integer number (32806010754).

Almost surely, 2^65612021507 is an apocalyptic number.

65612021507 is a deficient number, since it is larger than the sum of its proper divisors (1).

65612021507 is an equidigital number, since it uses as much as digits as its factorization.

65612021507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 35.

The spelling of 65612021507 in words is "sixty-five billion, six hundred twelve million, twenty-one thousand, five hundred seven".