11666650506 has 16 divisors (see below), whose sum is σ = 26666629824. Its totient is φ = 3333328704.

The previous prime is 11666650483. The next prime is 11666650547. The reversal of 11666650506 is 60505666611.

It is a super-2 number, since 2×11666650506² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 277777393 = 11666650506 / (1 + 1 + 6 + 6 + 6 + 6 + 5 + 0 + 5 + 0 + 6).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138888655 + ... + 138888738.

It is an arithmetic number, because the mean of its divisors is an integer number (1666664364).

Almost surely, 2^11666650506 is an apocalyptic number.

11666650506 is an abundant number, since it is smaller than the sum of its proper divisors (14999979318).

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

11666650506 is a wasteful number, since it uses less digits than its factorization.

11666650506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277777405.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 11666650506 in words is "eleven billion, six hundred sixty-six million, six hundred fifty thousand, five hundred six".