6629995985 has 8 divisors (see below), whose sum is σ = 8301908160. Its totient is φ = 5073388144.

The previous prime is 6629995973. The next prime is 6629995987. The reversal of 6629995985 is 5895999266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6629995985 - 2⁴ = 6629995969 is a prime.

It is a super-2 number, since 2×6629995985² = 87913693522232240450, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6629995987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28825955 + ... + 28826184.

It is an arithmetic number, because the mean of its divisors is an integer number (1037738520).

Almost surely, 2^6629995985 is an apocalyptic number.

It is an amenable number.

6629995985 is a deficient number, since it is larger than the sum of its proper divisors (1671912175).

6629995985 is a wasteful number, since it uses less digits than its factorization.

6629995985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57652167.

The product of its digits is 94478400, while the sum is 68.

The square root of 6629995985 is about 81424.7872886383. The cubic root of 6629995985 is about 1878.6148678516.

The spelling of 6629995985 in words is "six billion, six hundred twenty-nine million, nine hundred ninety-five thousand, nine hundred eighty-five".