665641147735 has 4 divisors (see below), whose sum is σ = 798769377288. Its totient is φ = 532512918184.

The previous prime is 665641147729. The next prime is 665641147739. The reversal of 665641147735 is 537741146566.

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

It is a cyclic number.

It is not a de Polignac number, because 665641147735 - 2³⁷ = 528202194263 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 (665641147739) 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, 66564114769 + ... + 66564114778.

It is an arithmetic number, because the mean of its divisors is an integer number (199692344322).

Almost surely, 2^665641147735 is an apocalyptic number.

665641147735 is a deficient number, since it is larger than the sum of its proper divisors (133128229553).

665641147735 is a wasteful number, since it uses less digits than its factorization.

665641147735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133128229552.

The product of its digits is 12700800, while the sum is 55.

The spelling of 665641147735 in words is "six hundred sixty-five billion, six hundred forty-one million, one hundred forty-seven thousand, seven hundred thirty-five".