66450731 has 2 divisors, whose sum is σ = 66450732. Its totient is φ = 66450730.

The previous prime is 66450719. The next prime is 66450743. The reversal of 66450731 is 13705466.

It is a balanced prime because it is at equal distance from previous prime (66450719) and next prime (66450743).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66450731 is a prime.

It is a super-2 number, since 2×66450731² = 8831399300868722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66450751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33225365 + 33225366.

It is an arithmetic number, because the mean of its divisors is an integer number (33225366).

Almost surely, 2^66450731 is an apocalyptic number.

66450731 is a deficient number, since it is larger than the sum of its proper divisors (1).

66450731 is an equidigital number, since it uses as much as digits as its factorization.

66450731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66450731 is about 8151.7317791988. The cubic root of 66450731 is about 405.0418714013.

The spelling of 66450731 in words is "sixty-six million, four hundred fifty thousand, seven hundred thirty-one".