155121667 has 8 divisors (see below), whose sum is σ = 163886400. Its totient is φ = 146584704.

The previous prime is 155121647. The next prime is 155121671. The reversal of 155121667 is 766121551.

155121667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 155121667 - 2⁷ = 155121539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155121607) 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, 55542 + ... + 58267.

It is an arithmetic number, because the mean of its divisors is an integer number (20485800).

Almost surely, 2^155121667 is an apocalyptic number.

155121667 is a deficient number, since it is larger than the sum of its proper divisors (8764733).

155121667 is a wasteful number, since it uses less digits than its factorization.

155121667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113885.

The product of its digits is 12600, while the sum is 34.

The square root of 155121667 is about 12454.7849038030. The cubic root of 155121667 is about 537.3090485942.

The spelling of 155121667 in words is "one hundred fifty-five million, one hundred twenty-one thousand, six hundred sixty-seven".