66473731 has 2 divisors, whose sum is σ = 66473732. Its totient is φ = 66473730.

The previous prime is 66473711. The next prime is 66473741. The reversal of 66473731 is 13737466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66473731 - 2¹⁷ = 66342659 is a prime.

It is a super-2 number, since 2×66473731² = 8837513826120722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66473711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33236865 + 33236866.

It is an arithmetic number, because the mean of its divisors is an integer number (33236866).

Almost surely, 2^66473731 is an apocalyptic number.

66473731 is the 5157-th centered pentagonal number.

66473731 is a deficient number, since it is larger than the sum of its proper divisors (1).

66473731 is an equidigital number, since it uses as much as digits as its factorization.

66473731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504, while the sum is 37.

The square root of 66473731 is about 8153.1424003264. The cubic root of 66473731 is about 405.0885971899.

The spelling of 66473731 in words is "sixty-six million, four hundred seventy-three thousand, seven hundred thirty-one".