651240231520 has 96 divisors (see below), whose sum is σ = 1547460827136. Its totient is φ = 258989760000.

The previous prime is 651240231497. The next prime is 651240231583. The reversal of 651240231520 is 25132042156.

It is a super-2 number, since 2×651240231520² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68785827 + ... + 68795293.

It is an arithmetic number, because the mean of its divisors is an integer number (16119383616).

Almost surely, 2^651240231520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651240231520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (773730413568).

651240231520 is an abundant number, since it is smaller than the sum of its proper divisors (896220595616).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

651240231520 is a wasteful number, since it uses less digits than its factorization.

651240231520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11924 (or 11916 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 651240231520 its reverse (25132042156), we get a palindrome (676372273676).

The spelling of 651240231520 in words is "six hundred fifty-one billion, two hundred forty million, two hundred thirty-one thousand, five hundred twenty".