66760537 has 2 divisors, whose sum is σ = 66760538. Its totient is φ = 66760536.

The previous prime is 66760531. The next prime is 66760567. The reversal of 66760537 is 73506766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49154121 + 17606416 = 7011^2 + 4196^2 .

It is a cyclic number.

It is not a de Polignac number, because 66760537 - 2⁷ = 66760409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66760537.

It is not a weakly prime, because it can be changed into another prime (66760531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33380268 + 33380269.

It is an arithmetic number, because the mean of its divisors is an integer number (33380269).

Almost surely, 2^66760537 is an apocalyptic number.

It is an amenable number.

66760537 is a deficient number, since it is larger than the sum of its proper divisors (1).

66760537 is an equidigital number, since it uses as much as digits as its factorization.

66760537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 158760, while the sum is 40.

The square root of 66760537 is about 8170.7121476650. The cubic root of 66760537 is about 405.6703565607.

The spelling of 66760537 in words is "sixty-six million, seven hundred sixty thousand, five hundred thirty-seven".