51565077785 has 16 divisors (see below), whose sum is σ = 66765405504. Its totient is φ = 38005993152.

The previous prime is 51565077779. The next prime is 51565077793. The reversal of 51565077785 is 58777056515.

It is a cyclic number.

It is not a de Polignac number, because 51565077785 - 2¹⁸ = 51564815641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51565077785.

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, 724427 + ... + 792416.

It is an arithmetic number, because the mean of its divisors is an integer number (4172837844).

Almost surely, 2^51565077785 is an apocalyptic number.

It is an amenable number.

51565077785 is a deficient number, since it is larger than the sum of its proper divisors (15200327719).

51565077785 is a wasteful number, since it uses less digits than its factorization.

51565077785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1517384.

The product of its (nonzero) digits is 10290000, while the sum is 56.

The spelling of 51565077785 in words is "fifty-one billion, five hundred sixty-five million, seventy-seven thousand, seven hundred eighty-five".