65961744773 has 4 divisors (see below), whose sum is σ = 65965576428. Its totient is φ = 65957913120.

The previous prime is 65961744733. The next prime is 65961744791. The reversal of 65961744773 is 37744716956.

It is a happy number.

65961744773 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1454888449 + 64506856324 = 38143^2 + 253982^2 .

It is a cyclic number.

It is not a de Polignac number, because 65961744773 - 2²² = 65957550469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65961744733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1889888 + ... + 1924473.

It is an arithmetic number, because the mean of its divisors is an integer number (16491394107).

Almost surely, 2^65961744773 is an apocalyptic number.

It is an amenable number.

65961744773 is a deficient number, since it is larger than the sum of its proper divisors (3831655).

65961744773 is a wasteful number, since it uses less digits than its factorization.

65961744773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3831654.

The product of its digits is 26671680, while the sum is 59.

The spelling of 65961744773 in words is "sixty-five billion, nine hundred sixty-one million, seven hundred forty-four thousand, seven hundred seventy-three".