66246431 has 2 divisors, whose sum is σ = 66246432. Its totient is φ = 66246430.

The previous prime is 66246419. The next prime is 66246437. The reversal of 66246431 is 13464266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66246431 - 2²² = 62052127 is a prime.

It is a super-2 number, since 2×66246431² = 8777179240475522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66246437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33123215 + 33123216.

It is an arithmetic number, because the mean of its divisors is an integer number (33123216).

Almost surely, 2^66246431 is an apocalyptic number.

66246431 is a deficient number, since it is larger than the sum of its proper divisors (1).

66246431 is an equidigital number, since it uses as much as digits as its factorization.

66246431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

The square root of 66246431 is about 8139.1910531698. The cubic root of 66246431 is about 404.6263504978.

The spelling of 66246431 in words is "sixty-six million, two hundred forty-six thousand, four hundred thirty-one".