10500120666 has 32 divisors (see below), whose sum is σ = 26666974080. Its totient is φ = 3000034368.

The previous prime is 10500120649. The next prime is 10500120671. The reversal of 10500120666 is 66602100501.

It is a happy number.

It is a super-2 number, since 2×10500120666² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13888671 + ... + 13889426.

It is an arithmetic number, because the mean of its divisors is an integer number (833342940).

Almost surely, 2^10500120666 is an apocalyptic number.

10500120666 is an abundant number, since it is smaller than the sum of its proper divisors (16166853414).

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

10500120666 is a wasteful number, since it uses less digits than its factorization.

10500120666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27778115 (or 27778109 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The spelling of 10500120666 in words is "ten billion, five hundred million, one hundred twenty thousand, six hundred sixty-six".