3681812052381 has 16 divisors (see below), whose sum is σ = 5079429129600. Its totient is φ = 2369403761088.

The previous prime is 3681812052349. The next prime is 3681812052389. The reversal of 3681812052381 is 1832502181863.

It is not a de Polignac number, because 3681812052381 - 2⁵ = 3681812052349 is a prime.

It is a super-2 number, since 2×3681812052381² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3681812052381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3681812052389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4032246 + ... + 4860311.

It is an arithmetic number, because the mean of its divisors is an integer number (317464320600).

Almost surely, 2^{3681812052381} is an apocalyptic number.

It is an amenable number.

3681812052381 is a deficient number, since it is larger than the sum of its proper divisors (1397617077219).

3681812052381 is a wasteful number, since it uses less digits than its factorization.

3681812052381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8897348.

The product of its (nonzero) digits is 552960, while the sum is 48.

The spelling of 3681812052381 in words is "three trillion, six hundred eighty-one billion, eight hundred twelve million, fifty-two thousand, three hundred eighty-one".