651661063252320 has 144 divisors (see below), whose sum is σ = 2256309111354480. Its totient is φ = 157978439562240.

The previous prime is 651661063252273. The next prime is 651661063252321. The reversal of 651661063252320 is 23252360166156.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 651661063252320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651661063252321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5609971735 + ... + 5610087894.

It is an arithmetic number, because the mean of its divisors is an integer number (15668813273295).

Almost surely, 2^{651661063252320} is an apocalyptic number.

651661063252320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

651661063252320 is an abundant number, since it is smaller than the sum of its proper divisors (1604648048102160).

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

651661063252320 is a wasteful number, since it uses less digits than its factorization.

651661063252320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11220059669 (or 11220059650 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 48.

The spelling of 651661063252320 in words is "six hundred fifty-one trillion, six hundred sixty-one billion, sixty-three million, two hundred fifty-two thousand, three hundred twenty".