19661944315 has 8 divisors (see below), whose sum is σ = 25409281968. Its totient is φ = 14519589600.

The previous prime is 19661944301. The next prime is 19661944321. The reversal of 19661944315 is 51344916691.

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

It is not a de Polignac number, because 19661944315 - 2⁹ = 19661943803 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151245661 + ... + 151245790.

It is an arithmetic number, because the mean of its divisors is an integer number (3176160246).

Almost surely, 2^19661944315 is an apocalyptic number.

19661944315 is a deficient number, since it is larger than the sum of its proper divisors (5747337653).

19661944315 is a wasteful number, since it uses less digits than its factorization.

19661944315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 302491469.

The product of its digits is 699840, while the sum is 49.

The spelling of 19661944315 in words is "nineteen billion, six hundred sixty-one million, nine hundred forty-four thousand, three hundred fifteen".