66501957607 has 2 divisors, whose sum is σ = 66501957608. Its totient is φ = 66501957606.

The previous prime is 66501957559. The next prime is 66501957629. The reversal of 66501957607 is 70675910566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66501957607 - 2¹⁹ = 66501433319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66501957667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250978803 + 33250978804.

It is an arithmetic number, because the mean of its divisors is an integer number (33250978804).

Almost surely, 2^66501957607 is an apocalyptic number.

66501957607 is a deficient number, since it is larger than the sum of its proper divisors (1).

66501957607 is an equidigital number, since it uses as much as digits as its factorization.

66501957607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2381400, while the sum is 52.

The spelling of 66501957607 in words is "sixty-six billion, five hundred one million, nine hundred fifty-seven thousand, six hundred seven".