15771238534464 has 448 divisors, whose sum is σ = 52783299624960. Its totient is φ = 4052232437760.

The previous prime is 15771238534463. The next prime is 15771238534483. The reversal of 15771238534464 is 46443583217751.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (448).

It is a junction number, because it is equal to n+sod(n) for n = 15771238534398 and 15771238534407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15771238534463) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 55813824 + ... + 56095680.

Almost surely, 2^{15771238534464} is an apocalyptic number.

15771238534464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15771238534464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26391649812480).

15771238534464 is an abundant number, since it is smaller than the sum of its proper divisors (37012061090496).

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

15771238534464 is a wasteful number, since it uses less digits than its factorization.

15771238534464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282006 (or 281996 counting only the distinct ones).

The product of its digits is 67737600, while the sum is 60.

The spelling of 15771238534464 in words is "fifteen trillion, seven hundred seventy-one billion, two hundred thirty-eight million, five hundred thirty-four thousand, four hundred sixty-four".