651661065650 has 48 divisors (see below), whose sum is σ = 1385323399104. Its totient is φ = 223414044480.

The previous prime is 651661065647. The next prime is 651661065661. The reversal of 651661065650 is 56560166156.

It is a junction number, because it is equal to n+sod(n) for n = 651661065595 and 651661065604.

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, 7859309 + ... + 7941791.

It is an arithmetic number, because the mean of its divisors is an integer number (28860904148).

Almost surely, 2^651661065650 is an apocalyptic number.

651661065650 is an abundant number, since it is smaller than the sum of its proper divisors (733662333454).

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

651661065650 is a wasteful number, since it uses less digits than its factorization.

651661065650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105075 (or 105070 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 651661065650 in words is "six hundred fifty-one billion, six hundred sixty-one million, sixty-five thousand, six hundred fifty".