11661975 has 60 divisors (see below), whose sum is σ = 23316216. Its totient is φ = 5728320.

The previous prime is 11661971. The next prime is 11662003. The reversal of 11661975 is 57916611.

It is a happy number.

It is not a de Polignac number, because 11661975 - 2² = 11661971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661971) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 26104 + ... + 26546.

Almost surely, 2^11661975 is an apocalyptic number.

11661975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11661975 is a deficient number, since it is larger than the sum of its proper divisors (11654241).

11661975 is a wasteful number, since it uses less digits than its factorization.

11661975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 464 counting only the distinct ones).

The product of its digits is 11340, while the sum is 36.

The square root of 11661975 is about 3414.9633965828. The cubic root of 11661975 is about 226.7726640439.

The spelling of 11661975 in words is "eleven million, six hundred sixty-one thousand, nine hundred seventy-five".