651006561 has 8 divisors (see below), whose sum is σ = 869569344. Its totient is φ = 433224080.

The previous prime is 651006553. The next prime is 651006583. The reversal of 651006561 is 165600156.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 651006561 - 2³ = 651006553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (651006661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193125 + ... + 196466.

It is an arithmetic number, because the mean of its divisors is an integer number (108696168).

Almost surely, 2^651006561 is an apocalyptic number.

It is an amenable number.

651006561 is a deficient number, since it is larger than the sum of its proper divisors (218562783).

651006561 is a wasteful number, since it uses less digits than its factorization.

651006561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390151.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 651006561 is about 25514.8302169542. The cubic root of 651006561 is about 866.6860144760.

The spelling of 651006561 in words is "six hundred fifty-one million, six thousand, five hundred sixty-one".