19951619484 has 72 divisors (see below), whose sum is σ = 49202309520. Its totient is φ = 6291618048.

The previous prime is 19951619477. The next prime is 19951619551. The reversal of 19951619484 is 48491615991.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3501742 + ... + 3507434.

It is an arithmetic number, because the mean of its divisors is an integer number (683365410).

Almost surely, 2^19951619484 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19951619484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24601154760).

19951619484 is an abundant number, since it is smaller than the sum of its proper divisors (29250690036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19951619484 is a wasteful number, since it uses less digits than its factorization.

19951619484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6547 (or 6526 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 57.

The spelling of 19951619484 in words is "nineteen billion, nine hundred fifty-one million, six hundred nineteen thousand, four hundred eighty-four".