651544056671 has 4 divisors (see below), whose sum is σ = 651590028672. Its totient is φ = 651498084672.

The previous prime is 651544056571. The next prime is 651544056697. The reversal of 651544056671 is 176650445156.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 651544056671 - 2¹⁰ = 651544055647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651544056071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22964735 + ... + 22993088.

It is an arithmetic number, because the mean of its divisors is an integer number (162897507168).

Almost surely, 2^651544056671 is an apocalyptic number.

651544056671 is a deficient number, since it is larger than the sum of its proper divisors (45972001).

651544056671 is a wasteful number, since it uses less digits than its factorization.

651544056671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45972000.

The product of its (nonzero) digits is 3024000, while the sum is 50.

The spelling of 651544056671 in words is "six hundred fifty-one billion, five hundred forty-four million, fifty-six thousand, six hundred seventy-one".