51351837815 has 4 divisors (see below), whose sum is σ = 61622205384. Its totient is φ = 41081470248.

The previous prime is 51351837781. The next prime is 51351837839. The reversal of 51351837815 is 51873815315.

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 51351837815 - 2¹⁴ = 51351821431 is a prime.

It is a super-2 number, since 2×51351837815² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51351837815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5135183777 + ... + 5135183786.

It is an arithmetic number, because the mean of its divisors is an integer number (15405551346).

Almost surely, 2^51351837815 is an apocalyptic number.

51351837815 is a deficient number, since it is larger than the sum of its proper divisors (10270367569).

51351837815 is a wasteful number, since it uses less digits than its factorization.

51351837815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10270367568.

The product of its digits is 504000, while the sum is 47.

The spelling of 51351837815 in words is "fifty-one billion, three hundred fifty-one million, eight hundred thirty-seven thousand, eight hundred fifteen".