993897766639 has 2 divisors, whose sum is σ = 993897766640. Its totient is φ = 993897766638.

The previous prime is 993897766633. The next prime is 993897766651. The reversal of 993897766639 is 936667798399.

It is a weak prime.

It is an emirp because it is prime and its reverse (936667798399) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 993897766639 - 2²⁹ = 993360895727 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (993897766633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 496948883319 + 496948883320.

It is an arithmetic number, because the mean of its divisors is an integer number (496948883320).

Almost surely, 2^993897766639 is an apocalyptic number.

993897766639 is a deficient number, since it is larger than the sum of its proper divisors (1).

993897766639 is an equidigital number, since it uses as much as digits as its factorization.

993897766639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4999796928, while the sum is 82.

The spelling of 993897766639 in words is "nine hundred ninety-three billion, eight hundred ninety-seven million, seven hundred sixty-six thousand, six hundred thirty-nine".