155223221355 has 24 divisors (see below), whose sum is σ = 269913204288. Its totient is φ = 82521219456.

The previous prime is 155223221347. The next prime is 155223221383. The reversal of 155223221355 is 553122322551.

155223221355 is a `hidden beast` number, since 1 + 5 + 52 + 232 + 21 + 355 = 666.

It is not a de Polignac number, because 155223221355 - 2³ = 155223221347 is a prime.

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, 5496147 + ... + 5524316.

It is an arithmetic number, because the mean of its divisors is an integer number (11246383512).

Almost surely, 2^155223221355 is an apocalyptic number.

155223221355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

155223221355 is a deficient number, since it is larger than the sum of its proper divisors (114689982933).

155223221355 is a wasteful number, since it uses less digits than its factorization.

155223221355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11020787 (or 11020784 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The spelling of 155223221355 in words is "one hundred fifty-five billion, two hundred twenty-three million, two hundred twenty-one thousand, three hundred fifty-five".