51487078415 has 4 divisors (see below), whose sum is σ = 61784494104. Its totient is φ = 41189662728.

The previous prime is 51487078393. The next prime is 51487078439.

It is a happy number.

51487078415 is nontrivially palindromic in base 10.

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 51487078415 - 2¹² = 51487074319 is a prime.

It is a super-4 number, since 4×51487078415⁴ (a number of 44 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5148707837 + ... + 5148707846.

It is an arithmetic number, because the mean of its divisors is an integer number (15446123526).

Almost surely, 2^51487078415 is an apocalyptic number.

51487078415 is a deficient number, since it is larger than the sum of its proper divisors (10297415689).

51487078415 is a wasteful number, since it uses less digits than its factorization.

51487078415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10297415688.

The product of its (nonzero) digits is 1254400, while the sum is 50.

The spelling of 51487078415 in words is "fifty-one billion, four hundred eighty-seven million, seventy-eight thousand, four hundred fifteen".