651066641 has 4 divisors (see below), whose sum is σ = 653660784. Its totient is φ = 648472500.

The previous prime is 651066631. The next prime is 651066653. The reversal of 651066641 is 146660156.

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 651066641 - 2¹⁰ = 651065617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651066631) 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, 1296695 + ... + 1297196.

It is an arithmetic number, because the mean of its divisors is an integer number (163415196).

Almost surely, 2^651066641 is an apocalyptic number.

It is an amenable number.

651066641 is a deficient number, since it is larger than the sum of its proper divisors (2594143).

651066641 is a wasteful number, since it uses less digits than its factorization.

651066641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2594142.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 651066641 is about 25516.0075442848. The cubic root of 651066641 is about 866.7126751874.

The spelling of 651066641 in words is "six hundred fifty-one million, sixty-six thousand, six hundred forty-one".