155123212104135 has 128 divisors (see below), whose sum is σ = 318717769835520. Its totient is φ = 70747954790400.

The previous prime is 155123212104127. The next prime is 155123212104139. The reversal of 155123212104135 is 531401212321551.

155123212104135 is a `hidden beast` number, since 1 + 5 + 5 + 1 + 2 + 3 + 21 + 210 + 413 + 5 = 666.

It is not a de Polignac number, because 155123212104135 - 2³ = 155123212104127 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155123212104135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155123212104139) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 44022199 + ... + 47415191.

It is an arithmetic number, because the mean of its divisors is an integer number (2489982576840).

Almost surely, 2^{155123212104135} is an apocalyptic number.

155123212104135 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155123212104135 is an abundant number, since it is smaller than the sum of its proper divisors (163594557731385).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155123212104135 is a wasteful number, since it uses less digits than its factorization.

155123212104135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3394846 (or 3394840 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

Adding to 155123212104135 its reverse (531401212321551), we get a palindrome (686524424425686).

The spelling of 155123212104135 in words is "one hundred fifty-five trillion, one hundred twenty-three billion, two hundred twelve million, one hundred four thousand, one hundred thirty-five".