51215724471 has 8 divisors (see below), whose sum is σ = 68294748400. Its totient is φ = 34140258432.

The previous prime is 51215724463. The next prime is 51215724473. The reversal of 51215724471 is 17442751215.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51215724471 - 2³ = 51215724463 is a prime.

It is a super-3 number, since 3×51215724471³ (a number of 33 digits) contains 333 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 (51215724473) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 855700 + ... + 913593.

It is an arithmetic number, because the mean of its divisors is an integer number (8536843550).

Almost surely, 2^51215724471 is an apocalyptic number.

51215724471 is a deficient number, since it is larger than the sum of its proper divisors (17079023929).

51215724471 is a wasteful number, since it uses less digits than its factorization.

51215724471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1778945.

The product of its digits is 78400, while the sum is 39.

The spelling of 51215724471 in words is "fifty-one billion, two hundred fifteen million, seven hundred twenty-four thousand, four hundred seventy-one".