66248431 has 2 divisors, whose sum is σ = 66248432. Its totient is φ = 66248430.

The previous prime is 66248401. The next prime is 66248443. The reversal of 66248431 is 13484266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66248431 - 2¹⁹ = 65724143 is a prime.

It is a super-2 number, since 2×66248431² = 8777709219923522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66248401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33124215 + 33124216.

It is an arithmetic number, because the mean of its divisors is an integer number (33124216).

Almost surely, 2^66248431 is an apocalyptic number.

66248431 is a deficient number, since it is larger than the sum of its proper divisors (1).

66248431 is an equidigital number, since it uses as much as digits as its factorization.

66248431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 34.

The square root of 66248431 is about 8139.3139145754. The cubic root of 66248431 is about 404.6304223879.

The spelling of 66248431 in words is "sixty-six million, two hundred forty-eight thousand, four hundred thirty-one".