155985553 has 8 divisors (see below), whose sum is σ = 160424000. Its totient is φ = 151584048.

The previous prime is 155985541. The next prime is 155985593. The reversal of 155985553 is 355589551.

It is a happy number.

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 155985553 - 2¹³ = 155977361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155985593) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 558 + ... + 17671.

It is an arithmetic number, because the mean of its divisors is an integer number (20053000).

Almost surely, 2^155985553 is an apocalyptic number.

It is an amenable number.

155985553 is a deficient number, since it is larger than the sum of its proper divisors (4438447).

155985553 is a wasteful number, since it uses less digits than its factorization.

155985553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18471.

The product of its digits is 675000, while the sum is 46.

The square root of 155985553 is about 12489.4176405467. The cubic root of 155985553 is about 538.3046429024.

The spelling of 155985553 in words is "one hundred fifty-five million, nine hundred eighty-five thousand, five hundred fifty-three".