65019891057 has 16 divisors (see below), whose sum is σ = 94660966848. Its totient is φ = 39369919680.

The previous prime is 65019891049. The next prime is 65019891067. The reversal of 65019891057 is 75019891056.

It is not a de Polignac number, because 65019891057 - 2³ = 65019891049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65019891037) 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, 865258 + ... + 937395.

It is an arithmetic number, because the mean of its divisors is an integer number (5916310428).

Almost surely, 2^65019891057 is an apocalyptic number.

It is an amenable number.

65019891057 is a deficient number, since it is larger than the sum of its proper divisors (29641075791).

65019891057 is a wasteful number, since it uses less digits than its factorization.

65019891057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1803760.

The product of its (nonzero) digits is 680400, while the sum is 51.

Subtracting 65019891057 from its reverse (75019891056), we obtain a palindrome (9999999999).

The spelling of 65019891057 in words is "sixty-five billion, nineteen million, eight hundred ninety-one thousand, fifty-seven".