155220318792 has 756 divisors, whose sum is σ = 566391785715. Its totient is φ = 39715220160.

The previous prime is 155220318769. The next prime is 155220318793. The reversal of 155220318792 is 297813022551.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

155220318792 is a `hidden beast` number, since 1 + 5 + 522 + 0 + 31 + 8 + 7 + 92 = 666.

It can be written as a sum of positive squares in only one way, i.e., 77610159396 + 77610159396 = 278586^2 + 278586^2 .

It is a tau number, because it is divible by the number of its divisors (756).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=278586.

It is not an unprimeable number, because it can be changed into a prime (155220318793) by changing a digit.

It is a polite number, since it can be written in 188 ways as a sum of consecutive naturals, for example, 2316721143 + ... + 2316721209.

Almost surely, 2^155220318792 is an apocalyptic number.

155220318792 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155220318792

155220318792 is an abundant number, since it is smaller than the sum of its proper divisors (411171466923).

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

155220318792 is an equidigital number, since it uses as much as digits as its factorization.

155220318792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The spelling of 155220318792 in words is "one hundred fifty-five billion, two hundred twenty million, three hundred eighteen thousand, seven hundred ninety-two".