61785827851 has 16 divisors (see below), whose sum is σ = 71274018816. Its totient is φ = 53031240000.

The previous prime is 61785827849. The next prime is 61785827867. The reversal of 61785827851 is 15872858716.

61785827851 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 61785827851 - 2¹ = 61785827849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61785827951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2195655 + ... + 2223616.

It is an arithmetic number, because the mean of its divisors is an integer number (4454626176).

Almost surely, 2^61785827851 is an apocalyptic number.

61785827851 is a deficient number, since it is larger than the sum of its proper divisors (9488190965).

61785827851 is a wasteful number, since it uses less digits than its factorization.

61785827851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4419354.

The product of its digits is 7526400, while the sum is 58.

The spelling of 61785827851 in words is "sixty-one billion, seven hundred eighty-five million, eight hundred twenty-seven thousand, eight hundred fifty-one".