155551506 has 32 divisors (see below), whose sum is σ = 342404928. Its totient is φ = 46717440.

The previous prime is 155551493. The next prime is 155551541. The reversal of 155551506 is 605155551.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2971 + ... + 17886.

It is an arithmetic number, because the mean of its divisors is an integer number (10700154).

Almost surely, 2^155551506 is an apocalyptic number.

155551506 is an abundant number, since it is smaller than the sum of its proper divisors (186853422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155551506 is a wasteful number, since it uses less digits than its factorization.

155551506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20986.

The product of its (nonzero) digits is 18750, while the sum is 33.

The square root of 155551506 is about 12472.0289448028. The cubic root of 155551506 is about 537.8048817280.

The spelling of 155551506 in words is "one hundred fifty-five million, five hundred fifty-one thousand, five hundred six".