6469691557 has 4 divisors (see below), whose sum is σ = 7393933216. Its totient is φ = 5545449900.

The previous prime is 6469691497. The next prime is 6469691561. The reversal of 6469691557 is 7551969646.

It is a happy number.

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 6469691557 - 2¹¹ = 6469689509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6469691567) 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, 462120819 + ... + 462120832.

It is an arithmetic number, because the mean of its divisors is an integer number (1848483304).

Almost surely, 2^6469691557 is an apocalyptic number.

It is an amenable number.

6469691557 is a deficient number, since it is larger than the sum of its proper divisors (924241659).

6469691557 is an equidigital number, since it uses as much as digits as its factorization.

6469691557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924241658.

The product of its digits is 12247200, while the sum is 58.

The square root of 6469691557 is about 80434.3928739442. The cubic root of 6469691557 is about 1863.3503761301.

The spelling of 6469691557 in words is "six billion, four hundred sixty-nine million, six hundred ninety-one thousand, five hundred fifty-seven".