51366045240561 has 32 divisors (see below), whose sum is σ = 73210956698880. Its totient is φ = 31955342284800.

The previous prime is 51366045240547. The next prime is 51366045240611. The reversal of 51366045240561 is 16504254066315.

It is a happy number.

It is not a de Polignac number, because 51366045240561 - 2²¹ = 51366043143409 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51366045240561.

It is not an unprimeable number, because it can be changed into a prime (51366045240061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106868985 + ... + 107348553.

It is an arithmetic number, because the mean of its divisors is an integer number (2287842396840).

Almost surely, 2^{51366045240561} is an apocalyptic number.

It is an amenable number.

51366045240561 is a deficient number, since it is larger than the sum of its proper divisors (21844911458319).

51366045240561 is a wasteful number, since it uses less digits than its factorization.

51366045240561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517497.

The product of its (nonzero) digits is 2592000, while the sum is 48.

The spelling of 51366045240561 in words is "fifty-one trillion, three hundred sixty-six billion, forty-five million, two hundred forty thousand, five hundred sixty-one".