51387299278315 has 144 divisors (see below), whose sum is σ = 88420355225856. Its totient is φ = 28283878022400.

The previous prime is 51387299278309. The next prime is 51387299278421.

51387299278315 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51387299278315 - 2¹⁵ = 51387299245547 is a prime.

It is a super-2 number, since 2×51387299278315² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 8022720 + ... + 12928210.

It is an arithmetic number, because the mean of its divisors is an integer number (614030244624).

Almost surely, 2^{51387299278315} is an apocalyptic number.

51387299278315 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51387299278315 is a deficient number, since it is larger than the sum of its proper divisors (37033055947541).

51387299278315 is a wasteful number, since it uses less digits than its factorization.

51387299278315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4905570 (or 4905550 counting only the distinct ones).

The product of its digits is 228614400, while the sum is 70.

The spelling of 51387299278315 in words is "fifty-one trillion, three hundred eighty-seven billion, two hundred ninety-nine million, two hundred seventy-eight thousand, three hundred fifteen".