3820471251861 has 32 divisors (see below), whose sum is σ = 5641239979008. Its totient is φ = 2280372906240.

The previous prime is 3820471251853. The next prime is 3820471251881. The reversal of 3820471251861 is 1681521740283.

It is not a de Polignac number, because 3820471251861 - 2³ = 3820471251853 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3820471251861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3820471251881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9908461 + ... + 10286813.

It is an arithmetic number, because the mean of its divisors is an integer number (176288749344).

Almost surely, 2^{3820471251861} is an apocalyptic number.

It is an amenable number.

3820471251861 is a deficient number, since it is larger than the sum of its proper divisors (1820768727147).

3820471251861 is a wasteful number, since it uses less digits than its factorization.

3820471251861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383001.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 3820471251861 in words is "three trillion, eight hundred twenty billion, four hundred seventy-one million, two hundred fifty-one thousand, eight hundred sixty-one".