51545520427 has 2 divisors, whose sum is σ = 51545520428. Its totient is φ = 51545520426.

The previous prime is 51545520421. The next prime is 51545520443. The reversal of 51545520427 is 72402554515.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51545520427 - 2¹⁵ = 51545487659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51545520427.

It is not a weakly prime, because it can be changed into another prime (51545520421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25772760213 + 25772760214.

It is an arithmetic number, because the mean of its divisors is an integer number (25772760214).

Almost surely, 2^51545520427 is an apocalyptic number.

51545520427 is a deficient number, since it is larger than the sum of its proper divisors (1).

51545520427 is an equidigital number, since it uses as much as digits as its factorization.

51545520427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 280000, while the sum is 40.

The spelling of 51545520427 in words is "fifty-one billion, five hundred forty-five million, five hundred twenty thousand, four hundred twenty-seven".