51240170723 has 64 divisors (see below), whose sum is σ = 63226552320. Its totient is φ = 40601088000.

The previous prime is 51240170699. The next prime is 51240170741. The reversal of 51240170723 is 32707104215.

It is a cyclic number.

It is not a de Polignac number, because 51240170723 - 2³⁰ = 50166428899 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51240170723.

It is not an unprimeable number, because it can be changed into a prime (51240170123) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 145156115 + ... + 145156467.

It is an arithmetic number, because the mean of its divisors is an integer number (987914880).

Almost surely, 2^51240170723 is an apocalyptic number.

51240170723 is a deficient number, since it is larger than the sum of its proper divisors (11986381597).

51240170723 is a wasteful number, since it uses less digits than its factorization.

51240170723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 708.

The product of its (nonzero) digits is 11760, while the sum is 32.

Adding to 51240170723 its reverse (32707104215), we get a palindrome (83947274938).

The spelling of 51240170723 in words is "fifty-one billion, two hundred forty million, one hundred seventy thousand, seven hundred twenty-three".