155442120651540 has 72 divisors (see below), whose sum is σ = 476176159754568. Its totient is φ = 41040823929600.

The previous prime is 155442120651511. The next prime is 155442120651581. The reversal of 155442120651540 is 45156021244551.

155442120651540 is a `hidden beast` number, since 1 + 5 + 5 + 4 + 4 + 2 + 120 + 6 + 515 + 4 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 10503588373776 + 144938532277764 = 3240924^2 + 12039042^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4275067647 + ... + 4275104006.

It is an arithmetic number, because the mean of its divisors is an integer number (6613557774369).

Almost surely, 2^{155442120651540} is an apocalyptic number.

155442120651540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155442120651540 is an abundant number, since it is smaller than the sum of its proper divisors (320734039103028).

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

155442120651540 is a wasteful number, since it uses less digits than its factorization.

155442120651540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8550171769 (or 8550171764 counting only the distinct ones).

The product of its (nonzero) digits is 960000, while the sum is 45.

The spelling of 155442120651540 in words is "one hundred fifty-five trillion, four hundred forty-two billion, one hundred twenty million, six hundred fifty-one thousand, five hundred forty".