1665056523 has 16 divisors (see below), whose sum is σ = 2431376640. Its totient is φ = 1007281824.

The previous prime is 1665056521. The next prime is 1665056537. The reversal of 1665056523 is 3256505661.

It is not a de Polignac number, because 1665056523 - 2¹ = 1665056521 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1665056521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 359511 + ... + 364112.

It is an arithmetic number, because the mean of its divisors is an integer number (151961040).

Almost surely, 2^1665056523 is an apocalyptic number.

1665056523 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1665056523 is a deficient number, since it is larger than the sum of its proper divisors (766320117).

1665056523 is a wasteful number, since it uses less digits than its factorization.

1665056523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 723698.

The product of its (nonzero) digits is 162000, while the sum is 39.

The square root of 1665056523 is about 40805.1041292630. The cubic root of 1665056523 is about 1185.2491711959.

The spelling of 1665056523 in words is "one billion, six hundred sixty-five million, fifty-six thousand, five hundred twenty-three".