155545121442 has 32 divisors (see below), whose sum is σ = 331571090304. Its totient is φ = 48475296000.

The previous prime is 155545121411. The next prime is 155545121447. The reversal of 155545121442 is 244121545551.

It is a self number, because there is not a number n which added to its sum of digits gives 155545121442.

It is not an unprimeable number, because it can be changed into a prime (155545121447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5034109 + ... + 5064912.

It is an arithmetic number, because the mean of its divisors is an integer number (10361596572).

Almost surely, 2^155545121442 is an apocalyptic number.

155545121442 is an abundant number, since it is smaller than the sum of its proper divisors (176025968862).

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

155545121442 is a wasteful number, since it uses less digits than its factorization.

155545121442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10099194.

The product of its digits is 160000, while the sum is 39.

Adding to 155545121442 its reverse (244121545551), we get a palindrome (399666666993).

The spelling of 155545121442 in words is "one hundred fifty-five billion, five hundred forty-five million, one hundred twenty-one thousand, four hundred forty-two".