51783386945 has 16 divisors (see below), whose sum is σ = 66696676560. Its totient is φ = 38455732224.

The previous prime is 51783386933. The next prime is 51783386951. The reversal of 51783386945 is 54968338715.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 150822961 + 51632563984 = 12281^2 + 227228^2 .

It is a cyclic number.

It is not a de Polignac number, because 51783386945 - 2⁴ = 51783386929 is a prime.

It is a super-3 number, since 3×51783386945³ (a number of 33 digits) contains 333 as substring.

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, 4166510 + ... + 4178919.

It is an arithmetic number, because the mean of its divisors is an integer number (4168542285).

Almost surely, 2^51783386945 is an apocalyptic number.

It is an amenable number.

51783386945 is a deficient number, since it is larger than the sum of its proper divisors (14913289615).

51783386945 is a wasteful number, since it uses less digits than its factorization.

51783386945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8345524.

The product of its digits is 21772800, while the sum is 59.

The spelling of 51783386945 in words is "fifty-one billion, seven hundred eighty-three million, three hundred eighty-six thousand, nine hundred forty-five".