665551150155 has 48 divisors (see below), whose sum is σ = 1155403941120. Its totient is φ = 354412800000.

The previous prime is 665551150153. The next prime is 665551150177. The reversal of 665551150155 is 551051155566.

It is not a de Polignac number, because 665551150155 - 2¹ = 665551150153 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 665551150155.

It is not an unprimeable number, because it can be changed into a prime (665551150153) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95061655 + ... + 95068655.

It is an arithmetic number, because the mean of its divisors is an integer number (24070915440).

Almost surely, 2^665551150155 is an apocalyptic number.

665551150155 is a deficient number, since it is larger than the sum of its proper divisors (489852790965).

665551150155 is a wasteful number, since it uses less digits than its factorization.

665551150155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9972 (or 9969 counting only the distinct ones).

The product of its (nonzero) digits is 562500, while the sum is 45.

The spelling of 665551150155 in words is "six hundred sixty-five billion, five hundred fifty-one million, one hundred fifty thousand, one hundred fifty-five".