66117679 has 2 divisors, whose sum is σ = 66117680. Its totient is φ = 66117678.

The previous prime is 66117661. The next prime is 66117683. The reversal of 66117679 is 97671166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66117679 - 2⁹ = 66117167 is a prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33058839 + 33058840.

It is an arithmetic number, because the mean of its divisors is an integer number (33058840).

Almost surely, 2^66117679 is an apocalyptic number.

66117679 is a deficient number, since it is larger than the sum of its proper divisors (1).

66117679 is an equidigital number, since it uses as much as digits as its factorization.

66117679 is an evil number, because the sum of its binary digits is even.

The product of its digits is 95256, while the sum is 43.

The square root of 66117679 is about 8131.2778208594. The cubic root of 66117679 is about 404.3640458577.

The spelling of 66117679 in words is "sixty-six million, one hundred seventeen thousand, six hundred seventy-nine".