155666001 has 8 divisors (see below), whose sum is σ = 216578880. Its totient is φ = 99265232.

The previous prime is 155665999. The next prime is 155666011. The reversal of 155666001 is 100666551.

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 155666001 - 2¹ = 155665999 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 155666001.

It is not an unprimeable number, because it can be changed into a prime (155666011) 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, 1127946 + ... + 1128083.

It is an arithmetic number, because the mean of its divisors is an integer number (27072360).

Almost surely, 2^155666001 is an apocalyptic number.

It is an amenable number.

155666001 is a deficient number, since it is larger than the sum of its proper divisors (60912879).

155666001 is a wasteful number, since it uses less digits than its factorization.

155666001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256055.

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 155666001 is about 12476.6181716040. The cubic root of 155666001 is about 537.9368013085.

The spelling of 155666001 in words is "one hundred fifty-five million, six hundred sixty-six thousand, one".