123505565355 has 24 divisors (see below), whose sum is σ = 217091478240. Its totient is φ = 64941891840.

The previous prime is 123505565321. The next prime is 123505565399. The reversal of 123505565355 is 553565505321.

123505565355 is a `hidden beast` number, since 1 + 2 + 3 + 50 + 5 + 565 + 35 + 5 = 666.

It is not a de Polignac number, because 123505565355 - 2¹² = 123505561259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 123505565355.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19324750 + ... + 19331139.

It is an arithmetic number, because the mean of its divisors is an integer number (9045478260).

Almost surely, 2^123505565355 is an apocalyptic number.

123505565355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

123505565355 is a deficient number, since it is larger than the sum of its proper divisors (93585912885).

123505565355 is a wasteful number, since it uses less digits than its factorization.

123505565355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38655971 (or 38655968 counting only the distinct ones).

The product of its (nonzero) digits is 1687500, while the sum is 45.

The spelling of 123505565355 in words is "one hundred twenty-three billion, five hundred five million, five hundred sixty-five thousand, three hundred fifty-five".