51520454515 has 16 divisors (see below), whose sum is σ = 64299429216. Its totient is φ = 39597868800.

The previous prime is 51520454471. The next prime is 51520454527. The reversal of 51520454515 is 51545402515.

It is not a de Polignac number, because 51520454515 - 2¹⁷ = 51520323443 is a prime.

It is a super-3 number, since 3×51520454515³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1951066 + ... + 1977295.

It is an arithmetic number, because the mean of its divisors is an integer number (4018714326).

Almost surely, 2^51520454515 is an apocalyptic number.

51520454515 is a deficient number, since it is larger than the sum of its proper divisors (12778974701).

51520454515 is a wasteful number, since it uses less digits than its factorization.

51520454515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3928470.

The product of its (nonzero) digits is 100000, while the sum is 37.

The spelling of 51520454515 in words is "fifty-one billion, five hundred twenty million, four hundred fifty-four thousand, five hundred fifteen".