6572020661 has 4 divisors (see below), whose sum is σ = 6584035872. Its totient is φ = 6560005452.

The previous prime is 6572020619. The next prime is 6572020673. The reversal of 6572020661 is 1660202756.

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 6572020661 - 2⁶ = 6572020597 is a prime.

It is a super-2 number, since 2×6572020661² = 86382911137221753842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6572020061) 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, 6006785 + ... + 6007878.

It is an arithmetic number, because the mean of its divisors is an integer number (1646008968).

Almost surely, 2^6572020661 is an apocalyptic number.

It is an amenable number.

6572020661 is a deficient number, since it is larger than the sum of its proper divisors (12015211).

6572020661 is a wasteful number, since it uses less digits than its factorization.

6572020661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12015210.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 6572020661 is about 81068.0002282035. Note that the first 3 decimals coincide. The cubic root of 6572020661 is about 1873.1230436441.

The spelling of 6572020661 in words is "six billion, five hundred seventy-two million, twenty thousand, six hundred sixty-one".