155511646115551 has 6 divisors (see below), whose sum is σ = 170934288705656. Its totient is φ = 141374223741300.

The previous prime is 155511646115537. The next prime is 155511646115597.

155511646115551 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 155511646115551 - 2⁵ = 155511646115519 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 (155511646115531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 642610107795 + ... + 642610108036.

Almost surely, 2^{155511646115551} is an apocalyptic number.

155511646115551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155511646115551 is a deficient number, since it is larger than the sum of its proper divisors (15422642590105).

155511646115551 is a wasteful number, since it uses less digits than its factorization.

155511646115551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285220215853 (or 1285220215842 counting only the distinct ones).

The product of its digits is 2250000, while the sum is 52.

The spelling of 155511646115551 in words is "one hundred fifty-five trillion, five hundred eleven billion, six hundred forty-six million, one hundred fifteen thousand, five hundred fifty-one".