66075656027531 has 2 divisors, whose sum is σ = 66075656027532. Its totient is φ = 66075656027530.

The previous prime is 66075656027527. The next prime is 66075656027543. The reversal of 66075656027531 is 13572065657066.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66075656027531 - 2² = 66075656027527 is a prime.

It is a super-2 number, since 2×66075656027531² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66075656027831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33037828013765 + 33037828013766.

It is an arithmetic number, because the mean of its divisors is an integer number (33037828013766).

Almost surely, 2^{66075656027531} is an apocalyptic number.

66075656027531 is a deficient number, since it is larger than the sum of its proper divisors (1).

66075656027531 is an equidigital number, since it uses as much as digits as its factorization.

66075656027531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628000, while the sum is 59.

The spelling of 66075656027531 in words is "sixty-six trillion, seventy-five billion, six hundred fifty-six million, twenty-seven thousand, five hundred thirty-one".