651221252533 has 4 divisors (see below), whose sum is σ = 654595456108. Its totient is φ = 647847048960.

The previous prime is 651221252531. The next prime is 651221252537. The reversal of 651221252533 is 335252122156.

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

It can be written as a sum of positive squares in 2 ways, for example, as 236411833284 + 414809419249 = 486222^2 + 644057^2 .

It is a cyclic number.

It is not a de Polignac number, because 651221252533 - 2¹ = 651221252531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 651221252492 and 651221252501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651221252531) 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, 1687101498 + ... + 1687101883.

It is an arithmetic number, because the mean of its divisors is an integer number (163648864027).

Almost surely, 2^651221252533 is an apocalyptic number.

It is an amenable number.

651221252533 is a deficient number, since it is larger than the sum of its proper divisors (3374203575).

651221252533 is a wasteful number, since it uses less digits than its factorization.

651221252533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3374203574.

The product of its digits is 108000, while the sum is 37.

Adding to 651221252533 its reverse (335252122156), we get a palindrome (986473374689).

The spelling of 651221252533 in words is "six hundred fifty-one billion, two hundred twenty-one million, two hundred fifty-two thousand, five hundred thirty-three".