19644661246 has 12 divisors (see below), whose sum is σ = 34277929488. Its totient is φ = 8419140492.

The previous prime is 19644661243. The next prime is 19644661249. The reversal of 19644661246 is 64216644691.

It is an interprime number because it is at equal distance from previous prime (19644661243) and next prime (19644661249).

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 19644661246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19644661243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 100227766 + ... + 100227961.

It is an arithmetic number, because the mean of its divisors is an integer number (2856494124).

Almost surely, 2^19644661246 is an apocalyptic number.

19644661246 is a deficient number, since it is larger than the sum of its proper divisors (14633268242).

19644661246 is a wasteful number, since it uses less digits than its factorization.

19644661246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200455743 (or 200455736 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 49.

The spelling of 19644661246 in words is "nineteen billion, six hundred forty-four million, six hundred sixty-one thousand, two hundred forty-six".