155587785551 has 8 divisors (see below), whose sum is σ = 169869357264. Its totient is φ = 141329085120.

The previous prime is 155587785491. The next prime is 155587785557.

155587785551 is nontrivially palindromic in base 10.

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 155587785551 - 2¹⁴ = 155587769167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155587785557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5703590 + ... + 5730803.

It is an arithmetic number, because the mean of its divisors is an integer number (21233669658).

Almost surely, 2^155587785551 is an apocalyptic number.

155587785551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155587785551 is a deficient number, since it is larger than the sum of its proper divisors (14281571713).

155587785551 is a wasteful number, since it uses less digits than its factorization.

155587785551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11435641.

The product of its digits is 49000000, while the sum is 62.

The spelling of 155587785551 in words is "one hundred fifty-five billion, five hundred eighty-seven million, seven hundred eighty-five thousand, five hundred fifty-one".