126565198991 has 8 divisors (see below), whose sum is σ = 157795572864. Its totient is φ = 98622232920.

The previous prime is 126565198987. The next prime is 126565198999. The reversal of 126565198991 is 199891565621.

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 126565198991 - 2² = 126565198987 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 (126565198999) 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, 821851865 + ... + 821852018.

It is an arithmetic number, because the mean of its divisors is an integer number (19724446608).

Almost surely, 2^126565198991 is an apocalyptic number.

126565198991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126565198991 is a deficient number, since it is larger than the sum of its proper divisors (31230373873).

126565198991 is a wasteful number, since it uses less digits than its factorization.

126565198991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1643703901.

The product of its digits is 10497600, while the sum is 62.

It can be divided in two parts, 1265 and 65198991, that added together give a palindrome (65200256).

The spelling of 126565198991 in words is "one hundred twenty-six billion, five hundred sixty-five million, one hundred ninety-eight thousand, nine hundred ninety-one".