51911267999 has 4 divisors (see below), whose sum is σ = 51987947064. Its totient is φ = 51834588936.

The previous prime is 51911267963. The next prime is 51911268001. The reversal of 51911267999 is 99976211915.

51911267999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51911267999 - 2¹⁶ = 51911202463 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 (51911867999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38338517 + ... + 38339870.

It is an arithmetic number, because the mean of its divisors is an integer number (12996986766).

Almost surely, 2^51911267999 is an apocalyptic number.

51911267999 is a deficient number, since it is larger than the sum of its proper divisors (76679065).

51911267999 is an equidigital number, since it uses as much as digits as its factorization.

51911267999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76679064.

The product of its digits is 2755620, while the sum is 59.

The spelling of 51911267999 in words is "fifty-one billion, nine hundred eleven million, two hundred sixty-seven thousand, nine hundred ninety-nine".