11662121553 has 16 divisors (see below), whose sum is σ = 15672214656. Its totient is φ = 7713538560.

The previous prime is 11662121551. The next prime is 11662121557. The reversal of 11662121553 is 35512126611.

It is not a de Polignac number, because 11662121553 - 2¹ = 11662121551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11662121551) 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 15 ways as a sum of consecutive naturals, for example, 298588 + ... + 335378.

It is an arithmetic number, because the mean of its divisors is an integer number (979513416).

Almost surely, 2^11662121553 is an apocalyptic number.

It is an amenable number.

11662121553 is a deficient number, since it is larger than the sum of its proper divisors (4010093103).

11662121553 is a wasteful number, since it uses less digits than its factorization.

11662121553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37624.

The product of its digits is 10800, while the sum is 33.

The spelling of 11662121553 in words is "eleven billion, six hundred sixty-two million, one hundred twenty-one thousand, five hundred fifty-three".