51815642819 has 8 divisors (see below), whose sum is σ = 53494504320. Its totient is φ = 50137243200.

The previous prime is 51815642797. The next prime is 51815642821. The reversal of 51815642819 is 91824651815.

51815642819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51815642819 - 2¹² = 51815638723 is a prime.

It is a super-2 number, since 2×51815642819² (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 (51815642839) 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, 120197 + ... + 343625.

It is an arithmetic number, because the mean of its divisors is an integer number (6686813040).

Almost surely, 2^51815642819 is an apocalyptic number.

51815642819 is a deficient number, since it is larger than the sum of its proper divisors (1678861501).

51815642819 is a wasteful number, since it uses less digits than its factorization.

51815642819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230941.

The product of its digits is 691200, while the sum is 50.

The spelling of 51815642819 in words is "fifty-one billion, eight hundred fifteen million, six hundred forty-two thousand, eight hundred nineteen".