19845607542 has 16 divisors (see below), whose sum is σ = 39693475632. Its totient is φ = 6614825760.

The previous prime is 19845607541. The next prime is 19845607571. The reversal of 19845607542 is 24570654891.

It is a super-2 number, since 2×19845607542² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19845607541) 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, 33192 + ... + 201972.

It is an arithmetic number, because the mean of its divisors is an integer number (2480842227).

Almost surely, 2^19845607542 is an apocalyptic number.

19845607542 is an abundant number, since it is smaller than the sum of its proper divisors (19847868090).

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

19845607542 is a wasteful number, since it uses less digits than its factorization.

19845607542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188383.

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 19845607542 in words is "nineteen billion, eight hundred forty-five million, six hundred seven thousand, five hundred forty-two".