3866655555 has 64 divisors (see below), whose sum is σ = 7875532800. Its totient is φ = 1763233920.

The previous prime is 3866655509. The next prime is 3866655563. The reversal of 3866655555 is 5555566683.

It is not a de Polignac number, because 3866655555 - 2¹³ = 3866647363 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 392986 + ... + 402704.

It is an arithmetic number, because the mean of its divisors is an integer number (123055200).

Almost surely, 2^3866655555 is an apocalyptic number.

3866655555 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

3866655555 is an abundant number, since it is smaller than the sum of its proper divisors (4008877245).

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

3866655555 is a wasteful number, since it uses less digits than its factorization.

3866655555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10161 (or 10155 counting only the distinct ones).

The product of its digits is 16200000, while the sum is 54.

The square root of 3866655555 is about 62182.4376733495. The cubic root of 3866655555 is about 1569.5620717263.

The spelling of 3866655555 in words is "three billion, eight hundred sixty-six million, six hundred fifty-five thousand, five hundred fifty-five".