6638758578366 has 32 divisors (see below), whose sum is σ = 13286849178240. Its totient is φ = 2211364428384.

The previous prime is 6638758578343. The next prime is 6638758578401.

6638758578366 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 6638758578291 and 6638758578300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158637841 + ... + 158679683.

It is an arithmetic number, because the mean of its divisors is an integer number (415214036820).

Almost surely, 2^{6638758578366} is an apocalyptic number.

6638758578366 is an abundant number, since it is smaller than the sum of its proper divisors (6648090599874).

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

6638758578366 is a wasteful number, since it uses less digits than its factorization.

6638758578366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59800.

The product of its digits is 7315660800, while the sum is 78.

The spelling of 6638758578366 in words is "six trillion, six hundred thirty-eight billion, seven hundred fifty-eight million, five hundred seventy-eight thousand, three hundred sixty-six".