19971650242 has 8 divisors (see below), whose sum is σ = 30923845632. Its totient is φ = 9663701700.

The previous prime is 19971650239. The next prime is 19971650249. The reversal of 19971650242 is 24205617991.

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

It is a junction number, because it is equal to n+sod(n) for n = 19971650192 and 19971650201.

It is not an unprimeable number, because it can be changed into a prime (19971650249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161061634 + ... + 161061757.

It is an arithmetic number, because the mean of its divisors is an integer number (3865480704).

Almost surely, 2^19971650242 is an apocalyptic number.

19971650242 is a deficient number, since it is larger than the sum of its proper divisors (10952195390).

19971650242 is a wasteful number, since it uses less digits than its factorization.

19971650242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322123424.

The product of its (nonzero) digits is 272160, while the sum is 46.

The spelling of 19971650242 in words is "nineteen billion, nine hundred seventy-one million, six hundred fifty thousand, two hundred forty-two".