11661640401 has 8 divisors (see below), whose sum is σ = 15549672384. Its totient is φ = 7774017680.

The previous prime is 11661640307. The next prime is 11661640453. The reversal of 11661640401 is 10404616611.

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 11661640401 - 2¹¹ = 11661638353 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (11661240401) 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, 28146 + ... + 155291.

It is an arithmetic number, because the mean of its divisors is an integer number (1943709048).

Almost surely, 2^11661640401 is an apocalyptic number.

It is an amenable number.

11661640401 is a deficient number, since it is larger than the sum of its proper divisors (3888031983).

11661640401 is a wasteful number, since it uses less digits than its factorization.

11661640401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204631.

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 11661640401 in words is "eleven billion, six hundred sixty-one million, six hundred forty thousand, four hundred one".