66199447965 has 64 divisors (see below), whose sum is σ = 126374054400. Its totient is φ = 28950856704.

The previous prime is 66199447957. The next prime is 66199447997. The reversal of 66199447965 is 56974499166.

It is not a de Polignac number, because 66199447965 - 2³ = 66199447957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66199447896 and 66199447905.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 232179 + ... + 431631.

It is an arithmetic number, because the mean of its divisors is an integer number (1974594600).

Almost surely, 2^66199447965 is an apocalyptic number.

It is an amenable number.

66199447965 is a deficient number, since it is larger than the sum of its proper divisors (60174606435).

66199447965 is a wasteful number, since it uses less digits than its factorization.

66199447965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199606.

The product of its digits is 88179840, while the sum is 66.

The spelling of 66199447965 in words is "sixty-six billion, one hundred ninety-nine million, four hundred forty-seven thousand, nine hundred sixty-five".