155220305445 has 24 divisors (see below), whose sum is σ = 269396647416. Its totient is φ = 82677049728.

The previous prime is 155220305441. The next prime is 155220305453. The reversal of 155220305445 is 544503022551.

155220305445 is a `hidden beast` number, since 1 + 5 + 5 + 2 + 203 + 0 + 5 + 445 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10125591876 + 145094713569 = 100626^2 + 380913^2 .

It is not a de Polignac number, because 155220305445 - 2² = 155220305441 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155220305441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2196354 + ... + 2265923.

It is an arithmetic number, because the mean of its divisors is an integer number (11224860309).

Almost surely, 2^155220305445 is an apocalyptic number.

155220305445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

155220305445 is a deficient number, since it is larger than the sum of its proper divisors (114176341971).

155220305445 is a wasteful number, since it uses less digits than its factorization.

155220305445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4463061 (or 4463058 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

Adding to 155220305445 its reverse (544503022551), we get a palindrome (699723327996).

The spelling of 155220305445 in words is "one hundred fifty-five billion, two hundred twenty million, three hundred five thousand, four hundred forty-five".