2165557405399 has 2 divisors, whose sum is σ = 2165557405400. Its totient is φ = 2165557405398.

The previous prime is 2165557405397. The next prime is 2165557405463. The reversal of 2165557405399 is 9935047555612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2165557405399 - 2¹ = 2165557405397 is a prime.

Together with 2165557405397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2165557405397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1082778702699 + 1082778702700.

It is an arithmetic number, because the mean of its divisors is an integer number (1082778702700).

Almost surely, 2^{2165557405399} is an apocalyptic number.

2165557405399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2165557405399 is an equidigital number, since it uses as much as digits as its factorization.

2165557405399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51030000, while the sum is 61.

The spelling of 2165557405399 in words is "two trillion, one hundred sixty-five billion, five hundred fifty-seven million, four hundred five thousand, three hundred ninety-nine".