665148865087 has 4 divisors (see below), whose sum is σ = 760170131536. Its totient is φ = 570127598640.

The previous prime is 665148864931. The next prime is 665148865141. The reversal of 665148865087 is 780568841566.

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 665148865087 - 2¹⁹ = 665148340799 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 (665148865687) 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, 47510633214 + ... + 47510633227.

It is an arithmetic number, because the mean of its divisors is an integer number (190042532884).

Almost surely, 2^665148865087 is an apocalyptic number.

665148865087 is a deficient number, since it is larger than the sum of its proper divisors (95021266449).

665148865087 is an equidigital number, since it uses as much as digits as its factorization.

665148865087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95021266448.

The product of its (nonzero) digits is 77414400, while the sum is 64.

The spelling of 665148865087 in words is "six hundred sixty-five billion, one hundred forty-eight million, eight hundred sixty-five thousand, eighty-seven".