6556011662778 has 64 divisors (see below), whose sum is σ = 13865539132800. Its totient is φ = 2063470510080.

The previous prime is 6556011662663. The next prime is 6556011662821. The reversal of 6556011662778 is 8772661106556.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 326898 + ... + 3635778.

It is an arithmetic number, because the mean of its divisors is an integer number (216649048950).

Almost surely, 2^{6556011662778} is an apocalyptic number.

6556011662778 is an abundant number, since it is smaller than the sum of its proper divisors (7309527470022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6556011662778 is a wasteful number, since it uses less digits than its factorization.

6556011662778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3309167.

The product of its (nonzero) digits is 25401600, while the sum is 60.

The spelling of 6556011662778 in words is "six trillion, five hundred fifty-six billion, eleven million, six hundred sixty-two thousand, seven hundred seventy-eight".