6686621038 has 16 divisors (see below), whose sum is σ = 10427924304. Its totient is φ = 3213080640.

The previous prime is 6686621027. The next prime is 6686621047. The reversal of 6686621038 is 8301266866.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 603045 + ... + 614032.

It is an arithmetic number, because the mean of its divisors is an integer number (651745269).

Almost surely, 2^6686621038 is an apocalyptic number.

6686621038 is a deficient number, since it is larger than the sum of its proper divisors (3741303266).

6686621038 is a wasteful number, since it uses less digits than its factorization.

6686621038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1217187.

The product of its (nonzero) digits is 497664, while the sum is 46.

The square root of 6686621038 is about 81771.7618619044. The cubic root of 6686621038 is about 1883.9479656128.

The spelling of 6686621038 in words is "six billion, six hundred eighty-six million, six hundred twenty-one thousand, thirty-eight".