3816009781251 has 16 divisors (see below), whose sum is σ = 5414379840000. Its totient is φ = 2382327116928.

The previous prime is 3816009781247. The next prime is 3816009781253. The reversal of 3816009781251 is 1521879006183.

It is not a de Polignac number, because 3816009781251 - 2² = 3816009781247 is a prime.

It is a super-2 number, since 2×3816009781251² (a number of 26 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 3816009781194 and 3816009781203.

It is not an unprimeable number, because it can be changed into a prime (3816009781253) 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, 187989151 + ... + 188009448.

It is an arithmetic number, because the mean of its divisors is an integer number (338398740000).

Almost surely, 2^{3816009781251} is an apocalyptic number.

3816009781251 is a deficient number, since it is larger than the sum of its proper divisors (1598370058749).

3816009781251 is a wasteful number, since it uses less digits than its factorization.

3816009781251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375998818.

The product of its (nonzero) digits is 725760, while the sum is 51.

The spelling of 3816009781251 in words is "three trillion, eight hundred sixteen billion, nine million, seven hundred eighty-one thousand, two hundred fifty-one".