528709975661 has 4 divisors (see below), whose sum is σ = 604239972192. Its totient is φ = 453179979132.

The previous prime is 528709975657. The next prime is 528709975687. The reversal of 528709975661 is 166579907825.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 528709975661 - 2² = 528709975657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (528709975631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37764998255 + ... + 37764998268.

It is an arithmetic number, because the mean of its divisors is an integer number (151059993048).

Almost surely, 2^528709975661 is an apocalyptic number.

It is an amenable number.

528709975661 is a deficient number, since it is larger than the sum of its proper divisors (75529996531).

528709975661 is an equidigital number, since it uses as much as digits as its factorization.

528709975661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75529996530.

The product of its (nonzero) digits is 57153600, while the sum is 65.

The spelling of 528709975661 in words is "five hundred twenty-eight billion, seven hundred nine million, nine hundred seventy-five thousand, six hundred sixty-one".