66737473949 has 2 divisors, whose sum is σ = 66737473950. Its totient is φ = 66737473948.

The previous prime is 66737473931. The next prime is 66737473961. The reversal of 66737473949 is 94937473766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61482673849 + 5254800100 = 247957^2 + 72490^2 .

It is a cyclic number.

It is not a de Polignac number, because 66737473949 - 2²⁰ = 66736425373 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66737473849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33368736974 + 33368736975.

It is an arithmetic number, because the mean of its divisors is an integer number (33368736975).

Almost surely, 2^66737473949 is an apocalyptic number.

It is an amenable number.

66737473949 is a deficient number, since it is larger than the sum of its proper divisors (1).

66737473949 is an equidigital number, since it uses as much as digits as its factorization.

66737473949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 144027072, while the sum is 65.

The spelling of 66737473949 in words is "sixty-six billion, seven hundred thirty-seven million, four hundred seventy-three thousand, nine hundred forty-nine".