155665555 has 8 divisors (see below), whose sum is σ = 186928992. Its totient is φ = 124445568.

The previous prime is 155665553. The next prime is 155665567. The reversal of 155665555 is 555566551.

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 155665555 - 2¹ = 155665553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155665553) 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, 2374 + ... + 17803.

It is an arithmetic number, because the mean of its divisors is an integer number (23366124).

Almost surely, 2^155665555 is an apocalyptic number.

155665555 is a deficient number, since it is larger than the sum of its proper divisors (31263437).

155665555 is a wasteful number, since it uses less digits than its factorization.

155665555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21725.

The product of its digits is 562500, while the sum is 43.

The square root of 155665555 is about 12476.6002981581. The cubic root of 155665555 is about 537.9362875589.

The spelling of 155665555 in words is "one hundred fifty-five million, six hundred sixty-five thousand, five hundred fifty-five".