6638957469 has 6 divisors (see below), whose sum is σ = 9589605246. Its totient is φ = 4425971640.

The previous prime is 6638957467. The next prime is 6638957491. The reversal of 6638957469 is 9647598366.

It can be written as a sum of positive squares in only one way, i.e., 6346034244 + 292923225 = 79662^2 + 17115^2 .

It is not a de Polignac number, because 6638957469 - 2¹ = 6638957467 is a prime.

It is a super-2 number, since 2×6638957469² = 88151512550381771922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6638957467) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 368830962 + ... + 368830979.

It is an arithmetic number, because the mean of its divisors is an integer number (1598267541).

Almost surely, 2^6638957469 is an apocalyptic number.

It is an amenable number.

6638957469 is a deficient number, since it is larger than the sum of its proper divisors (2950647777).

6638957469 is a wasteful number, since it uses less digits than its factorization.

6638957469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 737661947 (or 737661944 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 63.

The square root of 6638957469 is about 81479.7979194843. The cubic root of 6638957469 is about 1879.4609014278.

The spelling of 6638957469 in words is "six billion, six hundred thirty-eight million, nine hundred fifty-seven thousand, four hundred sixty-nine".