66196700649 has 12 divisors (see below), whose sum is σ = 95955331056. Its totient is φ = 43975191672.

The previous prime is 66196700623. The next prime is 66196700651. The reversal of 66196700649 is 94600769166.

It is not a de Polignac number, because 66196700649 - 2¹⁷ = 66196569577 is a prime.

It is a hoax number, since the sum of its digits (54) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66196700595 and 66196700604.

It is not an unprimeable number, because it can be changed into a prime (66196700659) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12992487 + ... + 12997580.

It is an arithmetic number, because the mean of its divisors is an integer number (7996277588).

Almost surely, 2^66196700649 is an apocalyptic number.

It is an amenable number.

66196700649 is a deficient number, since it is larger than the sum of its proper divisors (29758630407).

66196700649 is a wasteful number, since it uses less digits than its factorization.

66196700649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25990356 (or 25990353 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 66196700649 in words is "sixty-six billion, one hundred ninety-six million, seven hundred thousand, six hundred forty-nine".