651897499680 has 576 divisors, whose sum is σ = 2775351720960. Its totient is φ = 141161647104.

The previous prime is 651897499663. The next prime is 651897499711. The reversal of 651897499680 is 86994798156.

651897499680 is a `hidden beast` number, since 6 + 51 + 8 + 9 + 7 + 499 + 6 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 651897499599 and 651897499608.

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, 5108007 + ... + 5234073.

It is an arithmetic number, because the mean of its divisors is an integer number (4818318960).

Almost surely, 2^651897499680 is an apocalyptic number.

651897499680 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 651897499680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1387675860480).

651897499680 is an abundant number, since it is smaller than the sum of its proper divisors (2123454221280).

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

651897499680 is a wasteful number, since it uses less digits than its factorization.

651897499680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126123 (or 126103 counting only the distinct ones).

The product of its (nonzero) digits is 235146240, while the sum is 72.

The spelling of 651897499680 in words is "six hundred fifty-one billion, eight hundred ninety-seven million, four hundred ninety-nine thousand, six hundred eighty".