651913807680 has 672 divisors, whose sum is σ = 2462932010880. Its totient is φ = 162287124480.

The previous prime is 651913807669. The next prime is 651913807711. The reversal of 651913807680 is 86708319156.

651913807680 is a `hidden beast` number, since 6 + 5 + 191 + 380 + 76 + 8 + 0 = 666.

It is a super-2 number, since 2×651913807680² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 327100764 + ... + 327102756.

Almost surely, 2^651913807680 is an apocalyptic number.

651913807680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651913807680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1231466005440).

651913807680 is an abundant number, since it is smaller than the sum of its proper divisors (1811018203200).

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

651913807680 is a wasteful number, since it uses less digits than its factorization.

651913807680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2184 (or 2151 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 651913807680 in words is "six hundred fifty-one billion, nine hundred thirteen million, eight hundred seven thousand, six hundred eighty".