1655016566609 has 16 divisors (see below), whose sum is σ = 1936684675200. Its totient is φ = 1384700365440.

The previous prime is 1655016566587. The next prime is 1655016566639. The reversal of 1655016566609 is 9066656105561.

It is a happy number.

It is not a de Polignac number, because 1655016566609 - 2²⁴ = 1654999789393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1655016566639) 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, 1308572 + ... + 2241069.

It is an arithmetic number, because the mean of its divisors is an integer number (121042792200).

Almost surely, 2^{1655016566609} is an apocalyptic number.

It is an amenable number.

1655016566609 is a deficient number, since it is larger than the sum of its proper divisors (281668108591).

1655016566609 is a wasteful number, since it uses less digits than its factorization.

1655016566609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3551240.

The product of its (nonzero) digits is 8748000, while the sum is 56.

The spelling of 1655016566609 in words is "one trillion, six hundred fifty-five billion, sixteen million, five hundred sixty-six thousand, six hundred nine".