51415851415 has 4 divisors (see below), whose sum is σ = 61699021704. Its totient is φ = 41132681128.

The previous prime is 51415851413. The next prime is 51415851449.

51415851415 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 51415851415 - 2¹ = 51415851413 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51415851413) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5141585137 + ... + 5141585146.

It is an arithmetic number, because the mean of its divisors is an integer number (15424755426).

Almost surely, 2^51415851415 is an apocalyptic number.

51415851415 is a deficient number, since it is larger than the sum of its proper divisors (10283170289).

51415851415 is a wasteful number, since it uses less digits than its factorization.

51415851415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10283170288.

The product of its digits is 80000, while the sum is 40.

The spelling of 51415851415 in words is "fifty-one billion, four hundred fifteen million, eight hundred fifty-one thousand, four hundred fifteen".