19878072542 has 8 divisors (see below), whose sum is σ = 30090660600. Its totient is φ = 9847852344.

The previous prime is 19878072527. The next prime is 19878072559. The reversal of 19878072542 is 24527087891.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45591692 + ... + 45592127.

It is an arithmetic number, because the mean of its divisors is an integer number (3761332575).

Almost surely, 2^19878072542 is an apocalyptic number.

19878072542 is a deficient number, since it is larger than the sum of its proper divisors (10212588058).

19878072542 is a wasteful number, since it uses less digits than its factorization.

19878072542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91183930.

The product of its (nonzero) digits is 2257920, while the sum is 53.

The spelling of 19878072542 in words is "nineteen billion, eight hundred seventy-eight million, seventy-two thousand, five hundred forty-two".