661150551110 has 48 divisors (see below), whose sum is σ = 1391616495360. Its totient is φ = 225493349760.

The previous prime is 661150551107. The next prime is 661150551119. The reversal of 661150551110 is 11155051166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661150551119) 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, 3438575 + ... + 3625754.

It is an arithmetic number, because the mean of its divisors is an integer number (28992010320).

Almost surely, 2^661150551110 is an apocalyptic number.

661150551110 is an abundant number, since it is smaller than the sum of its proper divisors (730465944250).

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

661150551110 is a wasteful number, since it uses less digits than its factorization.

661150551110 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7064541 (or 7064534 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 32.

The spelling of 661150551110 in words is "six hundred sixty-one billion, one hundred fifty million, five hundred fifty-one thousand, one hundred ten".