51265256215 has 4 divisors (see below), whose sum is σ = 61518307464. Its totient is φ = 41012204968.

The previous prime is 51265256213. The next prime is 51265256243.

51265256215 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 51265256215 - 2¹ = 51265256213 is a prime.

It is a super-2 number, since 2×51265256215² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51265256213) 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, 5126525617 + ... + 5126525626.

It is an arithmetic number, because the mean of its divisors is an integer number (15379576866).

Almost surely, 2^51265256215 is an apocalyptic number.

51265256215 is a deficient number, since it is larger than the sum of its proper divisors (10253051249).

51265256215 is a wasteful number, since it uses less digits than its factorization.

51265256215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10253051248.

The product of its digits is 180000, while the sum is 40.

The spelling of 51265256215 in words is "fifty-one billion, two hundred sixty-five million, two hundred fifty-six thousand, two hundred fifteen".