66390598829 has 4 divisors (see below), whose sum is σ = 66391327260. Its totient is φ = 66389870400.

The previous prime is 66390598819. The next prime is 66390598849. The reversal of 66390598829 is 92889509366.

66390598829 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 5085829225 + 61304769604 = 71315^2 + 247598^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66390598829 is a prime.

It is a super-2 number, since 2×66390598829² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66390598819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204014 + ... + 417615.

It is an arithmetic number, because the mean of its divisors is an integer number (16597831815).

Almost surely, 2^66390598829 is an apocalyptic number.

It is an amenable number.

66390598829 is a deficient number, since it is larger than the sum of its proper divisors (728431).

66390598829 is a wasteful number, since it uses less digits than its factorization.

66390598829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728430.

The product of its (nonzero) digits is 50388480, while the sum is 65.

The spelling of 66390598829 in words is "sixty-six billion, three hundred ninety million, five hundred ninety-eight thousand, eight hundred twenty-nine".