11404521661 has 8 divisors (see below), whose sum is σ = 12282643800. Its totient is φ = 10526521152.

The previous prime is 11404521649. The next prime is 11404521679. The reversal of 11404521661 is 16612540411.

It can be written as a sum of positive squares in 4 ways, for example, as 453945636 + 10950576025 = 21306^2 + 104645^2 .

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 11404521661 - 2²³ = 11396133053 is a prime.

It is a super-2 number, since 2×11404521661² (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 (11404521691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287511 + ... + 324763.

It is an arithmetic number, because the mean of its divisors is an integer number (1535330475).

Almost surely, 2^11404521661 is an apocalyptic number.

It is an amenable number.

11404521661 is a deficient number, since it is larger than the sum of its proper divisors (878122139).

11404521661 is a wasteful number, since it uses less digits than its factorization.

11404521661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60815.

The product of its (nonzero) digits is 5760, while the sum is 31.

The spelling of 11404521661 in words is "eleven billion, four hundred four million, five hundred twenty-one thousand, six hundred sixty-one".