155611055515 has 4 divisors (see below), whose sum is σ = 186733266624. Its totient is φ = 124488844408.

The previous prime is 155611055491. The next prime is 155611055557. The reversal of 155611055515 is 515550116551.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 515550116551 = 31 ⋅16630648921.

It is a cyclic number.

It is not a de Polignac number, because 155611055515 - 2⁹ = 155611055003 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15561105547 + ... + 15561105556.

It is an arithmetic number, because the mean of its divisors is an integer number (46683316656).

Almost surely, 2^155611055515 is an apocalyptic number.

155611055515 is a deficient number, since it is larger than the sum of its proper divisors (31122211109).

155611055515 is an equidigital number, since it uses as much as digits as its factorization.

155611055515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31122211108.

The product of its (nonzero) digits is 93750, while the sum is 40.

The spelling of 155611055515 in words is "one hundred fifty-five billion, six hundred eleven million, fifty-five thousand, five hundred fifteen".