51142120509 has 8 divisors (see below), whose sum is σ = 68375297920. Its totient is φ = 34001845056.

The previous prime is 51142120453. The next prime is 51142120517. The reversal of 51142120509 is 90502124115.

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

It is not a de Polignac number, because 51142120509 - 2³¹ = 48994636861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51142120109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23224204 + ... + 23226405.

It is an arithmetic number, because the mean of its divisors is an integer number (8546912240).

Almost surely, 2^51142120509 is an apocalyptic number.

It is an amenable number.

51142120509 is a deficient number, since it is larger than the sum of its proper divisors (17233177411).

51142120509 is a wasteful number, since it uses less digits than its factorization.

51142120509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46450979.

The product of its (nonzero) digits is 3600, while the sum is 30.

The spelling of 51142120509 in words is "fifty-one billion, one hundred forty-two million, one hundred twenty thousand, five hundred nine".