172666367559 has 12 divisors (see below), whose sum is σ = 285036543376. Its totient is φ = 98666495712.

The previous prime is 172666367551. The next prime is 172666367563. The reversal of 172666367559 is 955763666271.

It is not a de Polignac number, because 172666367559 - 2³ = 172666367551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 2740735993 = 172666367559 / (1 + 7 + 2 + 6 + 6 + 6 + 3 + 6 + 7 + 5 + 5 + 9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 172666367496 and 172666367505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172666367551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1370367934 + ... + 1370368059.

Almost surely, 2^172666367559 is an apocalyptic number.

172666367559 is a deficient number, since it is larger than the sum of its proper divisors (112370175817).

172666367559 is a wasteful number, since it uses less digits than its factorization.

172666367559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2740736006 (or 2740736003 counting only the distinct ones).

The product of its digits is 85730400, while the sum is 63.

It can be divided in two parts, 172666 and 367559, that added together give a square (540225 = 735²).

The spelling of 172666367559 in words is "one hundred seventy-two billion, six hundred sixty-six million, three hundred sixty-seven thousand, five hundred fifty-nine".