528661160991 has 12 divisors (see below), whose sum is σ = 763659015600. Its totient is φ = 352423540800.

The previous prime is 528661160959. The next prime is 528661161013. The reversal of 528661160991 is 199061166825.

528661160991 is a `hidden beast` number, since 5 + 28 + 6 + 6 + 1 + 1 + 609 + 9 + 1 = 666.

It is not a de Polignac number, because 528661160991 - 2⁵ = 528661160959 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (528661160921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1240410 + ... + 1611191.

It is an arithmetic number, because the mean of its divisors is an integer number (63638251300).

Almost surely, 2^528661160991 is an apocalyptic number.

528661160991 is a deficient number, since it is larger than the sum of its proper divisors (234997854609).

528661160991 is a wasteful number, since it uses less digits than its factorization.

528661160991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2872206 (or 2872203 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 54.

The spelling of 528661160991 in words is "five hundred twenty-eight billion, six hundred sixty-one million, one hundred sixty thousand, nine hundred ninety-one".