155542205223450 has 72 divisors (see below), whose sum is σ = 432300060071100. Its totient is φ = 40047648238080.

The previous prime is 155542205223439. The next prime is 155542205223463. The reversal of 155542205223450 is 54322502245551.

155542205223450 is a `hidden beast` number, since 1 + 5 + 5 + 5 + 42 + 2 + 0 + 522 + 34 + 50 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 52884558319329 + 102657646904121 = 7272177^2 + 10132011^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 155542205223396 and 155542205223405.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 5959458415 + ... + 5959484514.

Almost surely, 2^{155542205223450} is an apocalyptic number.

155542205223450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

155542205223450 is an abundant number, since it is smaller than the sum of its proper divisors (276757854847650).

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

155542205223450 is a wasteful number, since it uses less digits than its factorization.

155542205223450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11918942976 (or 11918942968 counting only the distinct ones).

The product of its (nonzero) digits is 2400000, while the sum is 45.

The spelling of 155542205223450 in words is "one hundred fifty-five trillion, five hundred forty-two billion, two hundred five million, two hundred twenty-three thousand, four hundred fifty".