66761611727053 has 2 divisors, whose sum is σ = 66761611727054. Its totient is φ = 66761611727052.

The previous prime is 66761611727039. The next prime is 66761611727147. The reversal of 66761611727053 is 35072711616766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64916570354724 + 1845041372329 = 8057082^2 + 1358323^2 .

It is a cyclic number.

It is not a de Polignac number, because 66761611727053 - 2²¹ = 66761609629901 is a prime.

It is a super-2 number, since 2×66761611727053² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66761611727033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33380805863526 + 33380805863527.

It is an arithmetic number, because the mean of its divisors is an integer number (33380805863527).

Almost surely, 2^{66761611727053} is an apocalyptic number.

It is an amenable number.

66761611727053 is a deficient number, since it is larger than the sum of its proper divisors (1).

66761611727053 is an equidigital number, since it uses as much as digits as its factorization.

66761611727053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13335840, while the sum is 58.

The spelling of 66761611727053 in words is "sixty-six trillion, seven hundred sixty-one billion, six hundred eleven million, seven hundred twenty-seven thousand, fifty-three".