66534731 has 2 divisors, whose sum is σ = 66534732. Its totient is φ = 66534730.

The previous prime is 66534703. The next prime is 66534737. The reversal of 66534731 is 13743566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66534731 - 2⁶ = 66534667 is a prime.

It is a super-2 number, since 2×66534731² = 8853740858484722, 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 = 66534691 and 66534700.

It is not a weakly prime, because it can be changed into another prime (66534737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33267365 + 33267366.

It is an arithmetic number, because the mean of its divisors is an integer number (33267366).

Almost surely, 2^66534731 is an apocalyptic number.

66534731 is a deficient number, since it is larger than the sum of its proper divisors (1).

66534731 is an equidigital number, since it uses as much as digits as its factorization.

66534731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 35.

The square root of 66534731 is about 8156.8824314195. The cubic root of 66534731 is about 405.2124699306.

The spelling of 66534731 in words is "sixty-six million, five hundred thirty-four thousand, seven hundred thirty-one".