19782570166 has 16 divisors (see below), whose sum is σ = 31659225840. Its totient is φ = 9238378240.

The previous prime is 19782570161. The next prime is 19782570263. The reversal of 19782570166 is 66107528791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19782570161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2216311 + ... + 2225218.

It is an arithmetic number, because the mean of its divisors is an integer number (1978701615).

Almost surely, 2^19782570166 is an apocalyptic number.

19782570166 is a deficient number, since it is larger than the sum of its proper divisors (11876655674).

19782570166 is a wasteful number, since it uses less digits than its factorization.

19782570166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441679.

The product of its (nonzero) digits is 1270080, while the sum is 52.

The spelling of 19782570166 in words is "nineteen billion, seven hundred eighty-two million, five hundred seventy thousand, one hundred sixty-six".