126016565991 has 8 divisors (see below), whose sum is σ = 168317383920. Its totient is φ = 83863396032.

The previous prime is 126016565971. The next prime is 126016566001. The reversal of 126016565991 is 199565610621.

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

It is not a de Polignac number, because 126016565991 - 2¹⁷ = 126016434919 is a prime.

It is a super-3 number, since 3×126016565991³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126016565911) 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, 36910000 + ... + 36913413.

It is an arithmetic number, because the mean of its divisors is an integer number (21039672990).

Almost surely, 2^126016565991 is an apocalyptic number.

126016565991 is a deficient number, since it is larger than the sum of its proper divisors (42300817929).

126016565991 is an equidigital number, since it uses as much as digits as its factorization.

126016565991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73823985.

The product of its (nonzero) digits is 874800, while the sum is 51.

The spelling of 126016565991 in words is "one hundred twenty-six billion, sixteen million, five hundred sixty-five thousand, nine hundred ninety-one".