19717355142 has 48 divisors (see below), whose sum is σ = 44358678000. Its totient is φ = 6322180032.

The previous prime is 19717355137. The next prime is 19717355143. The reversal of 19717355142 is 24155371791.

19717355142 is a `hidden beast` number, since 1 + 97 + 1 + 7 + 3 + 551 + 4 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19717355143) 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, 70209 + ... + 210627.

It is an arithmetic number, because the mean of its divisors is an integer number (924139125).

Almost surely, 2^19717355142 is an apocalyptic number.

It is a pronic number, being equal to 140418×140419.

It is a practical number, because each smaller number is the sum of distinct divisors of 19717355142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22179339000).

19717355142 is an abundant number, since it is smaller than the sum of its proper divisors (24641322858).

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

19717355142 is a wasteful number, since it uses less digits than its factorization.

19717355142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140725 (or 140722 counting only the distinct ones).

The product of its digits is 264600, while the sum is 45.

The spelling of 19717355142 in words is "nineteen billion, seven hundred seventeen million, three hundred fifty-five thousand, one hundred forty-two".