651123648 has 168 divisors, whose sum is σ = 2147937792. Its totient is φ = 184730112.

The previous prime is 651123619. The next prime is 651123653. The reversal of 651123648 is 846321156.

It is a happy number.

651123648 is a `hidden beast` number, since 6 + 5 + 1 + 1 + 2 + 3 + 648 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 672861 + ... + 673827.

It is an arithmetic number, because the mean of its divisors is an integer number (12785344).

Almost surely, 2^651123648 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 651123648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073968896).

651123648 is an abundant number, since it is smaller than the sum of its proper divisors (1496814144).

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

651123648 is a wasteful number, since it uses less digits than its factorization.

651123648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159 (or 1146 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 651123648 is about 25517.1246029015. The cubic root of 651123648 is about 866.7379707277.

The spelling of 651123648 in words is "six hundred fifty-one million, one hundred twenty-three thousand, six hundred forty-eight".