66735631 has 2 divisors, whose sum is σ = 66735632. Its totient is φ = 66735630.

The previous prime is 66735593. The next prime is 66735637. The reversal of 66735631 is 13653766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66735631 - 2²¹ = 64638479 is a prime.

It is a super-2 number, since 2×66735631² = 8907288889936322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66735637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33367815 + 33367816.

It is an arithmetic number, because the mean of its divisors is an integer number (33367816).

Almost surely, 2^66735631 is an apocalyptic number.

66735631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66735631 is an equidigital number, since it uses as much as digits as its factorization.

66735631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 37.

The square root of 66735631 is about 8169.1879033353. The cubic root of 66735631 is about 405.6199031888.

The spelling of 66735631 in words is "sixty-six million, seven hundred thirty-five thousand, six hundred thirty-one".