19102057806 has 64 divisors (see below), whose sum is σ = 41502924288. Its totient is φ = 5826307968.

The previous prime is 19102057801. The next prime is 19102057841. The reversal of 19102057806 is 60875020191.

It is a super-2 number, since 2×19102057806² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19102057801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5962201 + ... + 5965403.

It is an arithmetic number, because the mean of its divisors is an integer number (648483192).

Almost surely, 2^19102057806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19102057806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20751462144).

19102057806 is an abundant number, since it is smaller than the sum of its proper divisors (22400866482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19102057806 is a wasteful number, since it uses less digits than its factorization.

19102057806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3865.

The product of its (nonzero) digits is 30240, while the sum is 39.

Adding to 19102057806 its reverse (60875020191), we get a palindrome (79977077997).

The spelling of 19102057806 in words is "nineteen billion, one hundred two million, fifty-seven thousand, eight hundred six".