3816575781645 has 64 divisors (see below), whose sum is σ = 7022861844480. Its totient is φ = 1752667123200.

The previous prime is 3816575781619. The next prime is 3816575781653. The reversal of 3816575781645 is 5461875756183.

It is not a de Polignac number, because 3816575781645 - 2¹⁹ = 3816575257357 is a prime.

It is a super-3 number, since 3×3816575781645³ (a number of 39 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (66) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

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, 7697400 + ... + 8178209.

It is an arithmetic number, because the mean of its divisors is an integer number (109732216320).

Almost surely, 2^{3816575781645} is an apocalyptic number.

It is an amenable number.

3816575781645 is a deficient number, since it is larger than the sum of its proper divisors (3206286062835).

3816575781645 is a wasteful number, since it uses less digits than its factorization.

3816575781645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15875706.

The product of its digits is 169344000, while the sum is 66.

The spelling of 3816575781645 in words is "three trillion, eight hundred sixteen billion, five hundred seventy-five million, seven hundred eighty-one thousand, six hundred forty-five".