65985557057 has 16 divisors (see below), whose sum is σ = 75842027520. Its totient is φ = 56237194512.

The previous prime is 65985557041. The next prime is 65985557089. The reversal of 65985557057 is 75075558956.

It is a happy number.

65985557057 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 65985557057 - 2⁴ = 65985557041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65985557557) 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, 1284488 + ... + 1334870.

It is an arithmetic number, because the mean of its divisors is an integer number (4740126720).

Almost surely, 2^65985557057 is an apocalyptic number.

It is an amenable number.

65985557057 is a deficient number, since it is larger than the sum of its proper divisors (9856470463).

65985557057 is a wasteful number, since it uses less digits than its factorization.

65985557057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51452.

The product of its (nonzero) digits is 66150000, while the sum is 62.

It can be divided in two parts, 6598 and 5557057, that added together give a palindrome (5563655).

The spelling of 65985557057 in words is "sixty-five billion, nine hundred eighty-five million, five hundred fifty-seven thousand, fifty-seven".