19440641671 has 8 divisors (see below), whose sum is σ = 21211392384. Its totient is φ = 17670460920.

The previous prime is 19440641657. The next prime is 19440641687. The reversal of 19440641671 is 17614604491.

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

It is a cyclic number.

It is not a de Polignac number, because 19440641671 - 2¹⁹ = 19440117383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19440641641) 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, 69541 + ... + 209086.

It is an arithmetic number, because the mean of its divisors is an integer number (2651424048).

Almost surely, 2^19440641671 is an apocalyptic number.

19440641671 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

19440641671 is a deficient number, since it is larger than the sum of its proper divisors (1770750713).

19440641671 is a wasteful number, since it uses less digits than its factorization.

19440641671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284981.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 19440641671 in words is "nineteen billion, four hundred forty million, six hundred forty-one thousand, six hundred seventy-one".