661151105510 has 32 divisors (see below), whose sum is σ = 1376468819712. Its totient is φ = 223949288160.

The previous prime is 661151105509. The next prime is 661151105521. The reversal of 661151105510 is 15501151166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56891876 + ... + 56903495.

It is an arithmetic number, because the mean of its divisors is an integer number (43014650616).

Almost surely, 2^661151105510 is an apocalyptic number.

661151105510 is an abundant number, since it is smaller than the sum of its proper divisors (715317714202).

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

661151105510 is a wasteful number, since it uses less digits than its factorization.

661151105510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113795468.

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

Adding to 661151105510 its reverse (15501151166), we get a palindrome (676652256676).

The spelling of 661151105510 in words is "six hundred sixty-one billion, one hundred fifty-one million, one hundred five thousand, five hundred ten".