2168210990591 has 8 divisors (see below), whose sum is σ = 2226873083424. Its totient is φ = 2109552150240.

The previous prime is 2168210990551. The next prime is 2168210990663. The reversal of 2168210990591 is 1950990128612.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2168210990591 is a prime.

It is a super-2 number, since 2×2168210990591² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2168210990551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 569561 + ... + 2158893.

It is an arithmetic number, because the mean of its divisors is an integer number (278359135428).

Almost surely, 2^{2168210990591} is an apocalyptic number.

2168210990591 is a deficient number, since it is larger than the sum of its proper divisors (58662092833).

2168210990591 is a wasteful number, since it uses less digits than its factorization.

2168210990591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626241.

The product of its (nonzero) digits is 699840, while the sum is 53.

The spelling of 2168210990591 in words is "two trillion, one hundred sixty-eight billion, two hundred ten million, nine hundred ninety thousand, five hundred ninety-one".