665155548511 has 16 divisors (see below), whose sum is σ = 708967839744. Its totient is φ = 622589071104.

The previous prime is 665155548479. The next prime is 665155548521. The reversal of 665155548511 is 115845551566.

It is a happy number.

It is not a de Polignac number, because 665155548511 - 2⁵ = 665155548479 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 (665155548521) 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, 6442351 + ... + 6544783.

It is an arithmetic number, because the mean of its divisors is an integer number (44310489984).

Almost surely, 2^665155548511 is an apocalyptic number.

665155548511 is a deficient number, since it is larger than the sum of its proper divisors (43812291233).

665155548511 is a wasteful number, since it uses less digits than its factorization.

665155548511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108510.

The product of its digits is 3600000, while the sum is 52.

The spelling of 665155548511 in words is "six hundred sixty-five billion, one hundred fifty-five million, five hundred forty-eight thousand, five hundred eleven".