66761537 has 2 divisors, whose sum is σ = 66761538. Its totient is φ = 66761536.

The previous prime is 66761531. The next prime is 66761587. The reversal of 66761537 is 73516766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62078641 + 4682896 = 7879^2 + 2164^2 .

It is a cyclic number.

It is not a de Polignac number, because 66761537 - 2¹² = 66757441 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66761494 and 66761503.

It is not a weakly prime, because it can be changed into another prime (66761531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33380768 + 33380769.

It is an arithmetic number, because the mean of its divisors is an integer number (33380769).

Almost surely, 2^66761537 is an apocalyptic number.

It is an amenable number.

66761537 is a deficient number, since it is larger than the sum of its proper divisors (1).

66761537 is an equidigital number, since it uses as much as digits as its factorization.

66761537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 158760, while the sum is 41.

The square root of 66761537 is about 8170.7733416122. The cubic root of 66761537 is about 405.6723820503.

The spelling of 66761537 in words is "sixty-six million, seven hundred sixty-one thousand, five hundred thirty-seven".