651221305642 has 16 divisors (see below), whose sum is σ = 1040638024512. Its totient is φ = 304576977600.

The previous prime is 651221305627. The next prime is 651221305663. The reversal of 651221305642 is 246503122156.

651221305642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58747734 + ... + 58758817.

It is an arithmetic number, because the mean of its divisors is an integer number (65039876532).

Almost surely, 2^651221305642 is an apocalyptic number.

651221305642 is a deficient number, since it is larger than the sum of its proper divisors (389416718870).

651221305642 is a wasteful number, since it uses less digits than its factorization.

651221305642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117506733.

The product of its (nonzero) digits is 86400, while the sum is 37.

Adding to 651221305642 its reverse (246503122156), we get a palindrome (897724427798).

The spelling of 651221305642 in words is "six hundred fifty-one billion, two hundred twenty-one million, three hundred five thousand, six hundred forty-two".