6557578772 has 12 divisors (see below), whose sum is σ = 11479368096. Its totient is φ = 3277759320.

The previous prime is 6557578747. The next prime is 6557578787. The reversal of 6557578772 is 2778757556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243104 + ... + 268727.

It is an arithmetic number, because the mean of its divisors is an integer number (956614008).

Almost surely, 2^6557578772 is an apocalyptic number.

It is an amenable number.

6557578772 is a deficient number, since it is larger than the sum of its proper divisors (4921789324).

6557578772 is a wasteful number, since it uses less digits than its factorization.

6557578772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515038 (or 515036 counting only the distinct ones).

The product of its digits is 28812000, while the sum is 59.

The square root of 6557578772 is about 80978.8785548429. The cubic root of 6557578772 is about 1871.7499867764.

The spelling of 6557578772 in words is "six billion, five hundred fifty-seven million, five hundred seventy-eight thousand, seven hundred seventy-two".