66250619377 has 2 divisors, whose sum is σ = 66250619378. Its totient is φ = 66250619376.

The previous prime is 66250619329. The next prime is 66250619381. The reversal of 66250619377 is 77391605266.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39694983696 + 26555635681 = 199236^2 + 162959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66250619377 is a prime.

It is a super-2 number, since 2×66250619377² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66250679377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33125309688 + 33125309689.

It is an arithmetic number, because the mean of its divisors is an integer number (33125309689).

Almost surely, 2^66250619377 is an apocalyptic number.

It is an amenable number.

66250619377 is a deficient number, since it is larger than the sum of its proper divisors (1).

66250619377 is an equidigital number, since it uses as much as digits as its factorization.

66250619377 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2857680, while the sum is 52.

The spelling of 66250619377 in words is "sixty-six billion, two hundred fifty million, six hundred nineteen thousand, three hundred seventy-seven".