51215504743 has 4 divisors (see below), whose sum is σ = 55155158968. Its totient is φ = 47275850520.

The previous prime is 51215504741. The next prime is 51215504749. The reversal of 51215504743 is 34740551215.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 51215504743 - 2¹ = 51215504741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51215504741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1969827093 + ... + 1969827118.

It is an arithmetic number, because the mean of its divisors is an integer number (13788789742).

Almost surely, 2^51215504743 is an apocalyptic number.

51215504743 is a deficient number, since it is larger than the sum of its proper divisors (3939654225).

51215504743 is a wasteful number, since it uses less digits than its factorization.

51215504743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3939654224.

The product of its (nonzero) digits is 84000, while the sum is 37.

The spelling of 51215504743 in words is "fifty-one billion, two hundred fifteen million, five hundred four thousand, seven hundred forty-three".