3667666591 has 2 divisors, whose sum is σ = 3667666592. Its totient is φ = 3667666590.

The previous prime is 3667666567. The next prime is 3667666703. The reversal of 3667666591 is 1956667663.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3667666591 - 2⁵ = 3667666559 is a prime.

It is a super-2 number, since 2×3667666591² = 26903556445475122562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3667666391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1833833295 + 1833833296.

It is an arithmetic number, because the mean of its divisors is an integer number (1833833296).

Almost surely, 2^3667666591 is an apocalyptic number.

3667666591 is a deficient number, since it is larger than the sum of its proper divisors (1).

3667666591 is an equidigital number, since it uses as much as digits as its factorization.

3667666591 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7348320, while the sum is 55.

The square root of 3667666591 is about 60561.2631225604. The cubic root of 3667666591 is about 1542.1618301684.

The spelling of 3667666591 in words is "three billion, six hundred sixty-seven million, six hundred sixty-six thousand, five hundred ninety-one".