661161500010 has 96 divisors (see below), whose sum is σ = 1925978176512. Its totient is φ = 155949632640.

The previous prime is 661161499987. The next prime is 661161500023. The reversal of 661161500010 is 10005161166.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8988234 + ... + 9061493.

It is an arithmetic number, because the mean of its divisors is an integer number (20062272672).

Almost surely, 2^661161500010 is an apocalyptic number.

661161500010 is an abundant number, since it is smaller than the sum of its proper divisors (1264816676502).

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

661161500010 is a wasteful number, since it uses less digits than its factorization.

661161500010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18049788 (or 18049785 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

Adding to 661161500010 its reverse (10005161166), we get a palindrome (671166661176).

The spelling of 661161500010 in words is "six hundred sixty-one billion, one hundred sixty-one million, five hundred thousand, ten".