19166252085 has 24 divisors (see below), whose sum is σ = 33234326424. Its totient is φ = 10218055680.

The previous prime is 19166252069. The next prime is 19166252087. The reversal of 19166252085 is 58025266191.

19166252085 is a `hidden beast` number, since 1 + 9 + 16 + 625 + 2 + 0 + 8 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 278422596 + 18887829489 = 16686^2 + 137433^2 .

It is not a de Polignac number, because 19166252085 - 2⁴ = 19166252069 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 19166252085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19166252087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37605 + ... + 199365.

It is an arithmetic number, because the mean of its divisors is an integer number (1384763601).

Almost surely, 2^19166252085 is an apocalyptic number.

19166252085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19166252085 is a deficient number, since it is larger than the sum of its proper divisors (14068074339).

19166252085 is a wasteful number, since it uses less digits than its factorization.

19166252085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164405 (or 164402 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 19166252085 in words is "nineteen billion, one hundred sixty-six million, two hundred fifty-two thousand, eighty-five".