66444731 has 2 divisors, whose sum is σ = 66444732. Its totient is φ = 66444730.

The previous prime is 66444671. The next prime is 66444739. The reversal of 66444731 is 13744466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66444731 - 2¹⁸ = 66182587 is a prime.

It is a super-2 number, since 2×66444731² = 8829804555324722, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66444691 and 66444700.

It is not a weakly prime, because it can be changed into another prime (66444739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33222365 + 33222366.

It is an arithmetic number, because the mean of its divisors is an integer number (33222366).

Almost surely, 2^66444731 is an apocalyptic number.

66444731 is a deficient number, since it is larger than the sum of its proper divisors (1).

66444731 is an equidigital number, since it uses as much as digits as its factorization.

66444731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 35.

The square root of 66444731 is about 8151.3637509315. The cubic root of 66444731 is about 405.0296802919.

The spelling of 66444731 in words is "sixty-six million, four hundred forty-four thousand, seven hundred thirty-one".