66372517 has 2 divisors, whose sum is σ = 66372518. Its totient is φ = 66372516.

The previous prime is 66372511. The next prime is 66372547. The reversal of 66372517 is 71527366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47761921 + 18610596 = 6911^2 + 4314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66372517 is a prime.

It is a super-2 number, since 2×66372517² = 8810622025830578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66372511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33186258 + 33186259.

It is an arithmetic number, because the mean of its divisors is an integer number (33186259).

Almost surely, 2^66372517 is an apocalyptic number.

It is an amenable number.

66372517 is a deficient number, since it is larger than the sum of its proper divisors (1).

66372517 is an equidigital number, since it uses as much as digits as its factorization.

66372517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 37.

The square root of 66372517 is about 8146.9329811899. The cubic root of 66372517 is about 404.8828945577.

The spelling of 66372517 in words is "sixty-six million, three hundred seventy-two thousand, five hundred seventeen".