2491288166399 has 8 divisors (see below), whose sum is σ = 2497478838000. Its totient is φ = 2485097980992.

The previous prime is 2491288166387. The next prime is 2491288166443. The reversal of 2491288166399 is 9936618821942.

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 not a de Polignac number, because 2491288166399 - 2⁴ = 2491288166383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2491288166329) 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, 11520332 + ... + 11734590.

It is an arithmetic number, because the mean of its divisors is an integer number (312184854750).

Almost surely, 2^{2491288166399} is an apocalyptic number.

2491288166399 is a deficient number, since it is larger than the sum of its proper divisors (6190671601).

2491288166399 is a wasteful number, since it uses less digits than its factorization.

2491288166399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243097.

The product of its digits is 80621568, while the sum is 68.

The spelling of 2491288166399 in words is "two trillion, four hundred ninety-one billion, two hundred eighty-eight million, one hundred sixty-six thousand, three hundred ninety-nine".