3661838850647 has 2 divisors, whose sum is σ = 3661838850648. Its totient is φ = 3661838850646.

The previous prime is 3661838850623. The next prime is 3661838850667. The reversal of 3661838850647 is 7460588381663.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3661838850647 - 2³⁰ = 3660765108823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3661838850667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1830919425323 + 1830919425324.

It is an arithmetic number, because the mean of its divisors is an integer number (1830919425324).

Almost surely, 2^{3661838850647} is an apocalyptic number.

3661838850647 is a deficient number, since it is larger than the sum of its proper divisors (1).

3661838850647 is an equidigital number, since it uses as much as digits as its factorization.

3661838850647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139345920, while the sum is 65.

The spelling of 3661838850647 in words is "three trillion, six hundred sixty-one billion, eight hundred thirty-eight million, eight hundred fifty thousand, six hundred forty-seven".