172989612731659 has 4 divisors (see below), whose sum is σ = 182094329191240. Its totient is φ = 163884896272080.

The previous prime is 172989612731581. The next prime is 172989612731699. The reversal of 172989612731659 is 956137216989271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172989612731659 is a prime.

It is a super-2 number, since 2×172989612731659² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (172989612731699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4552358229762 + ... + 4552358229799.

It is an arithmetic number, because the mean of its divisors is an integer number (45523582297810).

Almost surely, 2^{172989612731659} is an apocalyptic number.

172989612731659 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

172989612731659 is a deficient number, since it is larger than the sum of its proper divisors (9104716459581).

172989612731659 is an equidigital number, since it uses as much as digits as its factorization.

172989612731659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9104716459580.

The product of its digits is 617258880, while the sum is 76.

The spelling of 172989612731659 in words is "one hundred seventy-two trillion, nine hundred eighty-nine billion, six hundred twelve million, seven hundred thirty-one thousand, six hundred fifty-nine".