155687155123 has 4 divisors (see below), whose sum is σ = 156642291208. Its totient is φ = 154732019040.

The previous prime is 155687155111. The next prime is 155687155189. The reversal of 155687155123 is 321551786551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321551786551 = 23747 ⋅13540733.

It is a cyclic number.

It is not a de Polignac number, because 155687155123 - 2²⁵ = 155653600691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155687155103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477567798 + ... + 477568123.

It is an arithmetic number, because the mean of its divisors is an integer number (39160572802).

Almost surely, 2^155687155123 is an apocalyptic number.

155687155123 is a deficient number, since it is larger than the sum of its proper divisors (955136085).

155687155123 is an equidigital number, since it uses as much as digits as its factorization.

155687155123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955136084.

The product of its digits is 1260000, while the sum is 49.

The spelling of 155687155123 in words is "one hundred fifty-five billion, six hundred eighty-seven million, one hundred fifty-five thousand, one hundred twenty-three".