51218442705 has 8 divisors (see below), whose sum is σ = 81949508352. Its totient is φ = 27316502768.

The previous prime is 51218442703. The next prime is 51218442731. The reversal of 51218442705 is 50724481215.

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

It is a cyclic number.

It is not a de Polignac number, because 51218442705 - 2¹ = 51218442703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51218442703) 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, 1707281409 + ... + 1707281438.

It is an arithmetic number, because the mean of its divisors is an integer number (10243688544).

Almost surely, 2^51218442705 is an apocalyptic number.

It is an amenable number.

51218442705 is a deficient number, since it is larger than the sum of its proper divisors (30731065647).

51218442705 is a wasteful number, since it uses less digits than its factorization.

51218442705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414562855.

The product of its (nonzero) digits is 89600, while the sum is 39.

The spelling of 51218442705 in words is "fifty-one billion, two hundred eighteen million, four hundred forty-two thousand, seven hundred five".