155220977140 has 12 divisors (see below), whose sum is σ = 325964052036. Its totient is φ = 62088390848.

The previous prime is 155220977117. The next prime is 155220977161. The reversal of 155220977140 is 41779022551.

It can be written as a sum of positive squares in 2 ways, for example, as 123640843876 + 31580133264 = 351626^2 + 177708^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3880524409 + ... + 3880524448.

It is an arithmetic number, because the mean of its divisors is an integer number (27163671003).

Almost surely, 2^155220977140 is an apocalyptic number.

155220977140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155220977140 is an abundant number, since it is smaller than the sum of its proper divisors (170743074896).

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

155220977140 is a wasteful number, since it uses less digits than its factorization.

155220977140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7761048866 (or 7761048864 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 43.

Adding to 155220977140 its reverse (41779022551), we get a palindrome (196999999691).

The spelling of 155220977140 in words is "one hundred fifty-five billion, two hundred twenty million, nine hundred seventy-seven thousand, one hundred forty".