3818417915561 has 2 divisors, whose sum is σ = 3818417915562. Its totient is φ = 3818417915560.

The previous prime is 3818417915519. The next prime is 3818417915617. The reversal of 3818417915561 is 1655197148183.

3818417915561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3811647094336 + 6770821225 = 1952344^2 + 82285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3818417915561 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3818417915561.

It is not a weakly prime, because it can be changed into another prime (3818417915161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1909208957780 + 1909208957781.

It is an arithmetic number, because the mean of its divisors is an integer number (1909208957781).

Almost surely, 2^{3818417915561} is an apocalyptic number.

It is an amenable number.

3818417915561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3818417915561 is an equidigital number, since it uses as much as digits as its factorization.

3818417915561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7257600, while the sum is 59.

The spelling of 3818417915561 in words is "three trillion, eight hundred eighteen billion, four hundred seventeen million, nine hundred fifteen thousand, five hundred sixty-one".