51000061511605 has 16 divisors (see below), whose sum is σ = 63440422139520. Its totient is φ = 39312261479232.

The previous prime is 51000061511591. The next prime is 51000061511671. The reversal of 51000061511605 is 50611516000015.

It is a cyclic number.

It is not a de Polignac number, because 51000061511605 - 2³⁵ = 50965701773237 is a prime.

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, 361042899 + ... + 361184128.

It is an arithmetic number, because the mean of its divisors is an integer number (3965026383720).

Almost surely, 2^{51000061511605} is an apocalyptic number.

It is an amenable number.

51000061511605 is a deficient number, since it is larger than the sum of its proper divisors (12440360627915).

51000061511605 is a wasteful number, since it uses less digits than its factorization.

51000061511605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722227548.

The product of its (nonzero) digits is 4500, while the sum is 31.

The spelling of 51000061511605 in words is "fifty-one trillion, sixty-one million, five hundred eleven thousand, six hundred five".