51428650765 has 8 divisors (see below), whose sum is σ = 61808893848. Its totient is φ = 41079912000.

The previous prime is 51428650747. The next prime is 51428650771. The reversal of 51428650765 is 56705682415.

It can be written as a sum of positive squares in 4 ways, for example, as 13124680969 + 38303969796 = 114563^2 + 195714^2 .

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

It is not a de Polignac number, because 51428650765 - 2³⁵ = 17068912397 is a prime.

It is a super-2 number, since 2×51428650765² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7872486 + ... + 7879015.

It is an arithmetic number, because the mean of its divisors is an integer number (7726111731).

Almost surely, 2^51428650765 is an apocalyptic number.

It is an amenable number.

51428650765 is a deficient number, since it is larger than the sum of its proper divisors (10380243083).

51428650765 is a wasteful number, since it uses less digits than its factorization.

51428650765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15752159.

The product of its (nonzero) digits is 2016000, while the sum is 49.

The spelling of 51428650765 in words is "fifty-one billion, four hundred twenty-eight million, six hundred fifty thousand, seven hundred sixty-five".