51878548699 has 4 divisors (see below), whose sum is σ = 52652855464. Its totient is φ = 51104241936.

The previous prime is 51878548693. The next prime is 51878548721. The reversal of 51878548699 is 99684587815.

51878548699 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 51878548699 - 2²³ = 51870160091 is a prime.

It is a super-2 number, since 2×51878548699² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51878548693) 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, 387153282 + ... + 387153415.

It is an arithmetic number, because the mean of its divisors is an integer number (13163213866).

Almost surely, 2^51878548699 is an apocalyptic number.

51878548699 is a deficient number, since it is larger than the sum of its proper divisors (774306765).

51878548699 is an equidigital number, since it uses as much as digits as its factorization.

51878548699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774306764.

The product of its digits is 174182400, while the sum is 70.

The spelling of 51878548699 in words is "fifty-one billion, eight hundred seventy-eight million, five hundred forty-eight thousand, six hundred ninety-nine".