3818721763957 has 2 divisors, whose sum is σ = 3818721763958. Its totient is φ = 3818721763956.

The previous prime is 3818721763939. The next prime is 3818721764047. The reversal of 3818721763957 is 7593671278183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3621899990641 + 196821773316 = 1903129^2 + 443646^2 .

It is an emirp because it is prime and its reverse (7593671278183) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3818721763957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3818721763892 and 3818721763901.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3818721763657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1909360881978 + 1909360881979.

It is an arithmetic number, because the mean of its divisors is an integer number (1909360881979).

Almost surely, 2^{3818721763957} is an apocalyptic number.

It is an amenable number.

3818721763957 is a deficient number, since it is larger than the sum of its proper divisors (1).

3818721763957 is an equidigital number, since it uses as much as digits as its factorization.

3818721763957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 106686720, while the sum is 67.

The spelling of 3818721763957 in words is "three trillion, eight hundred eighteen billion, seven hundred twenty-one million, seven hundred sixty-three thousand, nine hundred fifty-seven".