155655556551 has 16 divisors (see below), whose sum is σ = 251564536320. Its totient is φ = 94336700760.

The previous prime is 155655556531. The next prime is 155655556559.

155655556551 is a `hidden beast` number, since 15 + 5 + 65 + 5 + 5 + 565 + 5 + 1 = 666.

155655556551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 155655556551 - 2¹¹ = 155655554503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155655556559) 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, 262046095 + ... + 262046688.

It is an arithmetic number, because the mean of its divisors is an integer number (15722783520).

Almost surely, 2^155655556551 is an apocalyptic number.

155655556551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155655556551 is a deficient number, since it is larger than the sum of its proper divisors (95908979769).

155655556551 is a wasteful number, since it uses less digits than its factorization.

155655556551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524092803 (or 524092797 counting only the distinct ones).

The product of its digits is 14062500, while the sum is 54.

The spelling of 155655556551 in words is "one hundred fifty-five billion, six hundred fifty-five million, five hundred fifty-six thousand, five hundred fifty-one".