155401666 has 8 divisors (see below), whose sum is σ = 266402880. Its totient is φ = 66600708.

The previous prime is 155401661. The next prime is 155401669. The reversal of 155401666 is 666104551.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (155401661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5550046 + ... + 5550073.

It is an arithmetic number, because the mean of its divisors is an integer number (33300360).

Almost surely, 2^155401666 is an apocalyptic number.

155401666 is a deficient number, since it is larger than the sum of its proper divisors (111001214).

155401666 is a wasteful number, since it uses less digits than its factorization.

155401666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11100128.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 155401666 is about 12466.0204556226. The cubic root of 155401666 is about 537.6321402897.

The spelling of 155401666 in words is "one hundred fifty-five million, four hundred one thousand, six hundred sixty-six".