651551633 has 2 divisors, whose sum is σ = 651551634. Its totient is φ = 651551632.

The previous prime is 651551627. The next prime is 651551653. The reversal of 651551633 is 336155156.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 397085329 + 254466304 = 19927^2 + 15952^2 .

It is a cyclic number.

It is not a de Polignac number, because 651551633 - 2¹⁴ = 651535249 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 651551593 and 651551602.

It is not a weakly prime, because it can be changed into another prime (651551603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 325775816 + 325775817.

It is an arithmetic number, because the mean of its divisors is an integer number (325775817).

Almost surely, 2^651551633 is an apocalyptic number.

It is an amenable number.

651551633 is a deficient number, since it is larger than the sum of its proper divisors (1).

651551633 is an equidigital number, since it uses as much as digits as its factorization.

651551633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40500, while the sum is 35.

The square root of 651551633 is about 25525.5094562283. The cubic root of 651551633 is about 866.9278320572.

The spelling of 651551633 in words is "six hundred fifty-one million, five hundred fifty-one thousand, six hundred thirty-three".