158319021217 has 12 divisors (see below), whose sum is σ = 195000380100. Its totient is φ = 127719545856.

The previous prime is 158319021173. The next prime is 158319021227. The reversal of 158319021217 is 712120913851.

It can be written as a sum of positive squares in 2 ways, for example, as 84825980001 + 73493041216 = 291249^2 + 271096^2 .

It is not a de Polignac number, because 158319021217 - 2¹⁵ = 158318988449 is a prime.

It is a super-2 number, since 2×158319021217² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 158319021217.

It is not an unprimeable number, because it can be changed into a prime (158319021227) 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, 95028592 + ... + 95030257.

It is an arithmetic number, because the mean of its divisors is an integer number (16250031675).

Almost surely, 2^158319021217 is an apocalyptic number.

158319021217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

158319021217 is a deficient number, since it is larger than the sum of its proper divisors (36681358883).

158319021217 is a wasteful number, since it uses less digits than its factorization.

158319021217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190058880 (or 190058873 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 40.

The spelling of 158319021217 in words is "one hundred fifty-eight billion, three hundred nineteen million, twenty-one thousand, two hundred seventeen".