6651000061 has 4 divisors (see below), whose sum is σ = 6674502112. Its totient is φ = 6627498012.

The previous prime is 6651000029. The next prime is 6651000079. The reversal of 6651000061 is 1600001566.

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 6651000061 - 2⁵ = 6651000029 is a prime.

It is a super-2 number, since 2×6651000061² = 88471603622844007442, 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 (6651000011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11750601 + ... + 11751166.

It is an arithmetic number, because the mean of its divisors is an integer number (1668625528).

Almost surely, 2^6651000061 is an apocalyptic number.

It is an amenable number.

6651000061 is a deficient number, since it is larger than the sum of its proper divisors (23502051).

6651000061 is a wasteful number, since it uses less digits than its factorization.

6651000061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23502050.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 6651000061 is about 81553.6636883960. The cubic root of 6651000061 is about 1880.5966173624.

The spelling of 6651000061 in words is "six billion, six hundred fifty-one million, sixty-one", and thus it is an aban number.