155140321242 has 8 divisors (see below), whose sum is σ = 310280642496. Its totient is φ = 51713440412.

The previous prime is 155140321207. The next prime is 155140321249. The reversal of 155140321242 is 242123041551.

It is a sphenic number, since it is the product of 3 distinct primes.

155140321242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (155140321249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12928360098 + ... + 12928360109.

It is an arithmetic number, because the mean of its divisors is an integer number (38785080312).

Almost surely, 2^155140321242 is an apocalyptic number.

155140321242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

155140321242 is a wasteful number, since it uses less digits than its factorization.

155140321242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25856720212.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 155140321242 its reverse (242123041551), we get a palindrome (397263362793).

The spelling of 155140321242 in words is "one hundred fifty-five billion, one hundred forty million, three hundred twenty-one thousand, two hundred forty-two".