1015521016664 has 128 divisors (see below), whose sum is σ = 2519030016000. Its totient is φ = 371577507840.

The previous prime is 1015521016649. The next prime is 1015521016669. The reversal of 1015521016664 is 4666101255101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1015521016669) 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, 4743812 + ... + 4953260.

It is an arithmetic number, because the mean of its divisors is an integer number (19679922000).

Almost surely, 2^{1015521016664} is an apocalyptic number.

1015521016664 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 1015521016664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1259515008000).

1015521016664 is an abundant number, since it is smaller than the sum of its proper divisors (1503508999336).

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

1015521016664 is a wasteful number, since it uses less digits than its factorization.

1015521016664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209953 (or 209949 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 38.

The spelling of 1015521016664 in words is "one trillion, fifteen billion, five hundred twenty-one million, sixteen thousand, six hundred sixty-four".