66737473699 has 24 divisors (see below), whose sum is σ = 77252743008. Its totient is φ = 57113844480.

The previous prime is 66737473679. The next prime is 66737473717. The reversal of 66737473699 is 99637473766.

66737473699 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-66737473699 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (67).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66737473669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 958434 + ... + 1025704.

It is an arithmetic number, because the mean of its divisors is an integer number (3218864292).

Almost surely, 2^66737473699 is an apocalyptic number.

66737473699 is a deficient number, since it is larger than the sum of its proper divisors (10515269309).

66737473699 is a wasteful number, since it uses less digits than its factorization.

66737473699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67435 (or 67368 counting only the distinct ones).

The product of its digits is 216040608, while the sum is 67.

Adding to 66737473699 its sum of digits (67), we get a palindrome (66737473766).

The spelling of 66737473699 in words is "sixty-six billion, seven hundred thirty-seven million, four hundred seventy-three thousand, six hundred ninety-nine".