4991350261689 has 45 divisors (see below), whose sum is σ = 8196037073301. Its totient is φ = 3024926716680.

The previous prime is 4991350261679. The next prime is 4991350261753. The reversal of 4991350261689 is 9861620531994.

The square root of 4991350261689 is 2234133.

It is a perfect power (a square), and thus also a powerful number.

4991350261689 is a `hidden beast` number, since 4 + 9 + 9 + 1 + 3 + 5 + 0 + 2 + 616 + 8 + 9 = 666.

4991350261689 is digitally balanced in base 12, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4991350261689 - 2²⁵ = 4991316707257 is a prime.

It is a super-2 number, since 2×4991350261689² (a number of 26 digits) contains 22 as substring.

4991350261689 is strictly pandigital in base 12.

It is not an unprimeable number, because it can be changed into a prime (4991350261649) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 221167884 + ... + 221190450.

Almost surely, 2^{4991350261689} is an apocalyptic number.

4991350261689 is the 2234133-rd square number.

4991350261689 is the 1117067-th centered octagonal number.

It is an amenable number.

4991350261689 is a deficient number, since it is larger than the sum of its proper divisors (3204686811612).

4991350261689 is an frugal number, since it uses more digits than its factorization.

4991350261689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45168 (or 22581 counting only the distinct ones).

The product of its (nonzero) digits is 25194240, while the sum is 63.

The spelling of 4991350261689 in words is "four trillion, nine hundred ninety-one billion, three hundred fifty million, two hundred sixty-one thousand, six hundred eighty-nine".