66996699 has 64 divisors (see below), whose sum is σ = 117642240. Its totient is φ = 32901120.

The previous prime is 66996697. The next prime is 66996703. The reversal of 66996699 is 99669966.

It is not a de Polignac number, because 66996699 - 2¹ = 66996697 is a prime.

66996699 is a strobogrammatic number because it is the same when read upside-down.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66996697) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 488959 + ... + 489095.

It is an arithmetic number, because the mean of its divisors is an integer number (1838160).

Almost surely, 2^66996699 is an apocalyptic number.

66996699 is a deficient number, since it is larger than the sum of its proper divisors (50645541).

66996699 is a wasteful number, since it uses less digits than its factorization.

66996699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260.

The product of its digits is 8503056, while the sum is 60.

The square root of 66996699 is about 8185.1511287208. The cubic root of 66996699 is about 406.1481397011.

The spelling of 66996699 in words is "sixty-six million, nine hundred ninety-six thousand, six hundred ninety-nine".