121666523 has 8 divisors (see below), whose sum is σ = 134597376. Its totient is φ = 109047400.

The previous prime is 121666507. The next prime is 121666541. The reversal of 121666523 is 325666121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121666523 - 2⁴ = 121666507 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121666523.

It is not an unprimeable number, because it can be changed into a prime (121666583) 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, 77111 + ... + 78672.

It is an arithmetic number, because the mean of its divisors is an integer number (16824672).

Almost surely, 2^121666523 is an apocalyptic number.

121666523 is a deficient number, since it is larger than the sum of its proper divisors (12930853).

121666523 is a wasteful number, since it uses less digits than its factorization.

121666523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155865.

The product of its digits is 12960, while the sum is 32.

The square root of 121666523 is about 11030.2548927937. The cubic root of 121666523 is about 495.5152584548.

The spelling of 121666523 in words is "one hundred twenty-one million, six hundred sixty-six thousand, five hundred twenty-three".