6638455769 has 4 divisors (see below), whose sum is σ = 7241951760. Its totient is φ = 6034959780.

The previous prime is 6638455721. The next prime is 6638455829. The reversal of 6638455769 is 9675548366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6638455769 - 2¹⁶ = 6638390233 is a prime.

It is a super-2 number, since 2×6638455769² = 88138189993938762722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6638455669) 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, 301747979 + ... + 301748000.

It is an arithmetic number, because the mean of its divisors is an integer number (1810487940).

Almost surely, 2^6638455769 is an apocalyptic number.

It is an amenable number.

6638455769 is a deficient number, since it is larger than the sum of its proper divisors (603495991).

6638455769 is a wasteful number, since it uses less digits than its factorization.

6638455769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603495990.

The product of its digits is 32659200, while the sum is 59.

The square root of 6638455769 is about 81476.7191840712. The cubic root of 6638455769 is about 1879.4135571827.

The spelling of 6638455769 in words is "six billion, six hundred thirty-eight million, four hundred fifty-five thousand, seven hundred sixty-nine".