3865776561220 has 48 divisors (see below), whose sum is σ = 9278048747520. Its totient is φ = 1325382678144.

The previous prime is 3865776561203. The next prime is 3865776561259. The reversal of 3865776561220 is 221656775683.

It is a happy 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, 7565586 + ... + 8060374.

It is an arithmetic number, because the mean of its divisors is an integer number (193292682240).

Almost surely, 2^{3865776561220} is an apocalyptic number.

It is an amenable number.

3865776561220 is an abundant number, since it is smaller than the sum of its proper divisors (5412272186300).

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

3865776561220 is a wasteful number, since it uses less digits than its factorization.

3865776561220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 550612 (or 550610 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 58.

The spelling of 3865776561220 in words is "three trillion, eight hundred sixty-five billion, seven hundred seventy-six million, five hundred sixty-one thousand, two hundred twenty".