11666621903 has 8 divisors (see below), whose sum is σ = 12070279200. Its totient is φ = 11263055328.

The previous prime is 11666621893. The next prime is 11666621951. The reversal of 11666621903 is 30912666611.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11666621903 - 2⁶ = 11666621839 is a prime.

It is a super-2 number, since 2×11666621903² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11666621963) by changing a digit.

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, 334550 + ... + 367772.

It is an arithmetic number, because the mean of its divisors is an integer number (1508784900).

Almost surely, 2^11666621903 is an apocalyptic number.

11666621903 is a deficient number, since it is larger than the sum of its proper divisors (403657297).

11666621903 is a wasteful number, since it uses less digits than its factorization.

11666621903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45361.

The product of its (nonzero) digits is 69984, while the sum is 41.

The spelling of 11666621903 in words is "eleven billion, six hundred sixty-six million, six hundred twenty-one thousand, nine hundred three".