651221253644 has 12 divisors (see below), whose sum is σ = 1227301593504. Its totient is φ = 300563655504.

The previous prime is 651221253547. The next prime is 651221253647. The reversal of 651221253644 is 446352122156.

It is not an unprimeable number, because it can be changed into a prime (651221253647) 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, 6261742772 + ... + 6261742875.

It is an arithmetic number, because the mean of its divisors is an integer number (102275132792).

Almost surely, 2^651221253644 is an apocalyptic number.

It is an amenable number.

651221253644 is a deficient number, since it is larger than the sum of its proper divisors (576080339860).

651221253644 is a wasteful number, since it uses less digits than its factorization.

651221253644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12523485664 (or 12523485662 counting only the distinct ones).

The product of its digits is 345600, while the sum is 41.

The spelling of 651221253644 in words is "six hundred fifty-one billion, two hundred twenty-one million, two hundred fifty-three thousand, six hundred forty-four".