667237247791 has 2 divisors, whose sum is σ = 667237247792. Its totient is φ = 667237247790.

The previous prime is 667237247767. The next prime is 667237247813. The reversal of 667237247791 is 197742732766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667237247791 - 2⁵ = 667237247759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667237247741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333618623895 + 333618623896.

It is an arithmetic number, because the mean of its divisors is an integer number (333618623896).

Almost surely, 2^667237247791 is an apocalyptic number.

667237247791 is a deficient number, since it is larger than the sum of its proper divisors (1).

667237247791 is an equidigital number, since it uses as much as digits as its factorization.

667237247791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37340352, while the sum is 61.

The spelling of 667237247791 in words is "six hundred sixty-seven billion, two hundred thirty-seven million, two hundred forty-seven thousand, seven hundred ninety-one".