66274531 has 2 divisors, whose sum is σ = 66274532. Its totient is φ = 66274530.

The previous prime is 66274529. The next prime is 66274589. The reversal of 66274531 is 13547266.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66274531 - 2¹ = 66274529 is a prime.

It is a super-2 number, since 2×66274531² = 8784626918539922, which contains 22 as substring.

Together with 66274529, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66274031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33137265 + 33137266.

It is an arithmetic number, because the mean of its divisors is an integer number (33137266).

Almost surely, 2^66274531 is an apocalyptic number.

66274531 is a deficient number, since it is larger than the sum of its proper divisors (1).

66274531 is an equidigital number, since it uses as much as digits as its factorization.

66274531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 34.

The square root of 66274531 is about 8140.9170859308. The cubic root of 66274531 is about 404.6835530421.

The spelling of 66274531 in words is "sixty-six million, two hundred seventy-four thousand, five hundred thirty-one".