30525665561 has 4 divisors (see below), whose sum is σ = 30532621824. Its totient is φ = 30518709300.

The previous prime is 30525665503. The next prime is 30525665581. The reversal of 30525665561 is 16556652503.

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, and also an emirpimes, since its reverse is a distinct semiprime: 16556652503 = 83 ⋅199477741.

It is a cyclic number.

It is not a de Polignac number, because 30525665561 - 2²² = 30521471257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30525665501) 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, 3471545 + ... + 3480326.

It is an arithmetic number, because the mean of its divisors is an integer number (7633155456).

Almost surely, 2^30525665561 is an apocalyptic number.

It is an amenable number.

30525665561 is a deficient number, since it is larger than the sum of its proper divisors (6956263).

30525665561 is an equidigital number, since it uses as much as digits as its factorization.

30525665561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6956262.

The product of its (nonzero) digits is 810000, while the sum is 44.

The spelling of 30525665561 in words is "thirty billion, five hundred twenty-five million, six hundred sixty-five thousand, five hundred sixty-one".