66974437 has 2 divisors, whose sum is σ = 66974438. Its totient is φ = 66974436.

The previous prime is 66974431. The next prime is 66974447. The reversal of 66974437 is 73447966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64496961 + 2477476 = 8031^2 + 1574^2 .

It is a cyclic number.

It is not a de Polignac number, because 66974437 - 2³ = 66974429 is a prime.

It is a super-2 number, since 2×66974437² = 8971150422933938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66974431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33487218 + 33487219.

It is an arithmetic number, because the mean of its divisors is an integer number (33487219).

Almost surely, 2^66974437 is an apocalyptic number.

It is an amenable number.

66974437 is a deficient number, since it is larger than the sum of its proper divisors (1).

66974437 is an equidigital number, since it uses as much as digits as its factorization.

66974437 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 762048, while the sum is 46.

The square root of 66974437 is about 8183.7911141475. The cubic root of 66974437 is about 406.1031490688.

The spelling of 66974437 in words is "sixty-six million, nine hundred seventy-four thousand, four hundred thirty-seven".