66707403491 has 2 divisors, whose sum is σ = 66707403492. Its totient is φ = 66707403490.

The previous prime is 66707403473. The next prime is 66707403533. The reversal of 66707403491 is 19430470766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66707403491 - 2²² = 66703209187 is a prime.

It is a super-2 number, since 2×66707403491² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66707403461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33353701745 + 33353701746.

It is an arithmetic number, because the mean of its divisors is an integer number (33353701746).

Almost surely, 2^66707403491 is an apocalyptic number.

66707403491 is a deficient number, since it is larger than the sum of its proper divisors (1).

66707403491 is an equidigital number, since it uses as much as digits as its factorization.

66707403491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 66707403491 in words is "sixty-six billion, seven hundred seven million, four hundred three thousand, four hundred ninety-one".