661200651250 has 20 divisors (see below), whose sum is σ = 1239354503046. Its totient is φ = 264480260000.

The previous prime is 661200651211. The next prime is 661200651257. The reversal of 661200651250 is 52156002166.

661200651250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 39703352049 + 621497299201 = 199257^2 + 788351^2 .

It is not an unprimeable number, because it can be changed into a prime (661200651257) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 264479011 + ... + 264481510.

Almost surely, 2^661200651250 is an apocalyptic number.

661200651250 is a deficient number, since it is larger than the sum of its proper divisors (578153851796).

661200651250 is an equidigital number, since it uses as much as digits as its factorization.

661200651250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528960543 (or 528960528 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 661200651250 in words is "six hundred sixty-one billion, two hundred million, six hundred fifty-one thousand, two hundred fifty".