1066504531521 has 32 divisors (see below), whose sum is σ = 1690736366592. Its totient is φ = 589457367360.

The previous prime is 1066504531511. The next prime is 1066504531529. The reversal of 1066504531521 is 1251354056601.

1066504531521 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1066504531521 - 2⁹ = 1066504531009 is a prime.

It is a super-2 number, since 2×1066504531521² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 1066504531521.

It is not an unprimeable number, because it can be changed into a prime (1066504531529) 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, 14940445 + ... + 15011658.

It is an arithmetic number, because the mean of its divisors is an integer number (52835511456).

Almost surely, 2^{1066504531521} is an apocalyptic number.

1066504531521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1066504531521 is a deficient number, since it is larger than the sum of its proper divisors (624231835071).

1066504531521 is a wasteful number, since it uses less digits than its factorization.

1066504531521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29952213.

The product of its (nonzero) digits is 108000, while the sum is 39.

The spelling of 1066504531521 in words is "one trillion, sixty-six billion, five hundred four million, five hundred thirty-one thousand, five hundred twenty-one".