651640673 has 2 divisors, whose sum is σ = 651640674. Its totient is φ = 651640672.

The previous prime is 651640667. The next prime is 651640679. The reversal of 651640673 is 376046156.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (651640667) and next prime (651640679).

It can be written as a sum of positive squares in only one way, i.e., 645769744 + 5870929 = 25412^2 + 2423^2 .

It is a cyclic number.

It is not a de Polignac number, because 651640673 - 2⁶ = 651640609 is a prime.

It is not a weakly prime, because it can be changed into another prime (651640679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325820336 + 325820337.

It is an arithmetic number, because the mean of its divisors is an integer number (325820337).

Almost surely, 2^651640673 is an apocalyptic number.

It is an amenable number.

651640673 is a deficient number, since it is larger than the sum of its proper divisors (1).

651640673 is an equidigital number, since it uses as much as digits as its factorization.

651640673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 651640673 is about 25527.2535342132. The cubic root of 651640673 is about 866.9673212470.

The spelling of 651640673 in words is "six hundred fifty-one million, six hundred forty thousand, six hundred seventy-three".