3865218318890 has 16 divisors (see below), whose sum is σ = 7145430622632. Its totient is φ = 1504301183424.

The previous prime is 3865218318889. The next prime is 3865218318911. The reversal of 3865218318890 is 988138125683.

It can be written as a sum of positive squares in 4 ways, for example, as 3468977025361 + 396241293529 = 1862519^2 + 629477^2 .

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, 5223267629 + ... + 5223268368.

Almost surely, 2^{3865218318890} is an apocalyptic number.

3865218318890 is a deficient number, since it is larger than the sum of its proper divisors (3280212303742).

3865218318890 is a wasteful number, since it uses less digits than its factorization.

3865218318890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10446536041.

The product of its (nonzero) digits is 19906560, while the sum is 62.

The spelling of 3865218318890 in words is "three trillion, eight hundred sixty-five billion, two hundred eighteen million, three hundred eighteen thousand, eight hundred ninety".