155505647 has 16 divisors (see below), whose sum is σ = 181494432. Its totient is φ = 131665920.

The previous prime is 155505619. The next prime is 155505683. The reversal of 155505647 is 746505551.

It is a cyclic number.

It is not a de Polignac number, because 155505647 - 2⁶ = 155505583 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155505647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155505547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13853 + ... + 22425.

It is an arithmetic number, because the mean of its divisors is an integer number (11343402).

Almost surely, 2^155505647 is an apocalyptic number.

155505647 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

155505647 is a deficient number, since it is larger than the sum of its proper divisors (25988785).

155505647 is a wasteful number, since it uses less digits than its factorization.

155505647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8698.

The product of its (nonzero) digits is 105000, while the sum is 38.

The square root of 155505647 is about 12470.1903353558. The cubic root of 155505647 is about 537.7520254559.

The spelling of 155505647 in words is "one hundred fifty-five million, five hundred five thousand, six hundred forty-seven".