66737144557 has 2 divisors, whose sum is σ = 66737144558. Its totient is φ = 66737144556.

The previous prime is 66737144549. The next prime is 66737144561. The reversal of 66737144557 is 75544173766.

66737144557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35429027076 + 31308117481 = 188226^2 + 176941^2 .

It is a cyclic number.

It is not a de Polignac number, because 66737144557 - 2³ = 66737144549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66737144498 and 66737144507.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66737144527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368572278 + 33368572279.

It is an arithmetic number, because the mean of its divisors is an integer number (33368572279).

Almost surely, 2^66737144557 is an apocalyptic number.

It is an amenable number.

66737144557 is a deficient number, since it is larger than the sum of its proper divisors (1).

66737144557 is an equidigital number, since it uses as much as digits as its factorization.

66737144557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14817600, while the sum is 55.

The spelling of 66737144557 in words is "sixty-six billion, seven hundred thirty-seven million, one hundred forty-four thousand, five hundred fifty-seven".