51378143817 has 64 divisors (see below), whose sum is σ = 92328800256. Its totient is φ = 24542818560.

The previous prime is 51378143813. The next prime is 51378143821. The reversal of 51378143817 is 71834187315.

It is an interprime number because it is at equal distance from previous prime (51378143813) and next prime (51378143821).

It is not a de Polignac number, because 51378143817 - 2² = 51378143813 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51378143813) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 757263 + ... + 822315.

It is an arithmetic number, because the mean of its divisors is an integer number (1442637504).

Almost surely, 2^51378143817 is an apocalyptic number.

It is an amenable number.

51378143817 is a deficient number, since it is larger than the sum of its proper divisors (40950656439).

51378143817 is a wasteful number, since it uses less digits than its factorization.

51378143817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65350.

The product of its digits is 564480, while the sum is 48.

The spelling of 51378143817 in words is "fifty-one billion, three hundred seventy-eight million, one hundred forty-three thousand, eight hundred seventeen".