6557969878 has 16 divisors (see below), whose sum is σ = 10637210304. Its totient is φ = 3020440960.

The previous prime is 6557969857. The next prime is 6557969879. The reversal of 6557969878 is 8789697556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6557969879) 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, 2050333 + ... + 2053528.

It is an arithmetic number, because the mean of its divisors is an integer number (664825644).

Almost surely, 2^6557969878 is an apocalyptic number.

6557969878 is a deficient number, since it is larger than the sum of its proper divisors (4079240426).

6557969878 is a wasteful number, since it uses less digits than its factorization.

6557969878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4103927.

The product of its digits is 228614400, while the sum is 70.

The square root of 6557969878 is about 80981.2933831018. The cubic root of 6557969878 is about 1871.7871975683.

The spelling of 6557969878 in words is "six billion, five hundred fifty-seven million, nine hundred sixty-nine thousand, eight hundred seventy-eight".