11605550006621 has 4 divisors (see below), whose sum is σ = 11764530143772. Its totient is φ = 11446569869472.

The previous prime is 11605550006539. The next prime is 11605550006647. The reversal of 11605550006621 is 12660005550611.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3477520065721 + 8128029940900 = 1864811^2 + 2850970^2 .

It is a cyclic number.

It is not a de Polignac number, because 11605550006621 - 2²² = 11605545812317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11605550006671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79490068466 + ... + 79490068611.

It is an arithmetic number, because the mean of its divisors is an integer number (2941132535943).

Almost surely, 2^{11605550006621} is an apocalyptic number.

It is an amenable number.

11605550006621 is a deficient number, since it is larger than the sum of its proper divisors (158980137151).

11605550006621 is an equidigital number, since it uses as much as digits as its factorization.

11605550006621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158980137150.

The product of its (nonzero) digits is 54000, while the sum is 38.

The spelling of 11605550006621 in words is "eleven trillion, six hundred five billion, five hundred fifty million, six thousand, six hundred twenty-one".