155647816987 has 16 divisors (see below), whose sum is σ = 176339772000. Its totient is φ = 136369384704.

The previous prime is 155647816967. The next prime is 155647816991. The reversal of 155647816987 is 789618746551.

155647816987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155647816987 - 2³⁵ = 121288078619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155647816937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3476562 + ... + 3521047.

It is an arithmetic number, because the mean of its divisors is an integer number (11021235750).

Almost surely, 2^155647816987 is an apocalyptic number.

155647816987 is a deficient number, since it is larger than the sum of its proper divisors (20691955013).

155647816987 is a wasteful number, since it uses less digits than its factorization.

155647816987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6997710.

The product of its digits is 101606400, while the sum is 67.

The spelling of 155647816987 in words is "one hundred fifty-five billion, six hundred forty-seven million, eight hundred sixteen thousand, nine hundred eighty-seven".