51205144405 has 16 divisors (see below), whose sum is σ = 61686261504. Its totient is φ = 40804196800.

The previous prime is 51205144369. The next prime is 51205144411. The reversal of 51205144405 is 50444150215.

It is a happy number.

It is not a de Polignac number, because 51205144405 - 2¹¹ = 51205142357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3436782 + ... + 3451648.

It is an arithmetic number, because the mean of its divisors is an integer number (3855391344).

Almost surely, 2^51205144405 is an apocalyptic number.

It is an amenable number.

51205144405 is a deficient number, since it is larger than the sum of its proper divisors (10481117099).

51205144405 is a wasteful number, since it uses less digits than its factorization.

51205144405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17516.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 51205144405 in words is "fifty-one billion, two hundred five million, one hundred forty-four thousand, four hundred five".