51201247505 has 16 divisors (see below), whose sum is σ = 62196981840. Its totient is φ = 40459819008.

The previous prime is 51201247477. The next prime is 51201247507. The reversal of 51201247505 is 50574210215.

51201247505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 45212176 + 51156035329 = 6724^2 + 226177^2 .

It is a cyclic number.

It is not a de Polignac number, because 51201247505 - 2²⁴ = 51184470289 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51201247507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10901 + ... + 320189.

It is an arithmetic number, because the mean of its divisors is an integer number (3887311365).

Almost surely, 2^51201247505 is an apocalyptic number.

It is an amenable number.

51201247505 is a deficient number, since it is larger than the sum of its proper divisors (10995734335).

51201247505 is a wasteful number, since it uses less digits than its factorization.

51201247505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309700.

The product of its (nonzero) digits is 14000, while the sum is 32.

The spelling of 51201247505 in words is "fifty-one billion, two hundred one million, two hundred forty-seven thousand, five hundred five".