19615721942936 has 128 divisors (see below), whose sum is σ = 42506776166400. Its totient is φ = 8312503879680.

The previous prime is 19615721942933. The next prime is 19615721943001. The reversal of 19615721942936 is 63924912751691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19615721942933) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5839748825 + ... + 5839752183.

It is an arithmetic number, because the mean of its divisors is an integer number (332084188800).

Almost surely, 2^{19615721942936} 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 19615721942936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21253388083200).

19615721942936 is an abundant number, since it is smaller than the sum of its proper divisors (22891054223464).

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

19615721942936 is a wasteful number, since it uses less digits than its factorization.

19615721942936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5409 (or 5405 counting only the distinct ones).

The product of its digits is 44089920, while the sum is 65.

The spelling of 19615721942936 in words is "nineteen trillion, six hundred fifteen billion, seven hundred twenty-one million, nine hundred forty-two thousand, nine hundred thirty-six".