155449391540 has 24 divisors (see below), whose sum is σ = 326916173472. Its totient is φ = 62089765920.

The previous prime is 155449391533. The next prime is 155449391549. The reversal of 155449391540 is 45193944551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155449391549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5610254 + ... + 5637893.

It is an arithmetic number, because the mean of its divisors is an integer number (13621507228).

Almost surely, 2^155449391540 is an apocalyptic number.

155449391540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155449391540 is an abundant number, since it is smaller than the sum of its proper divisors (171466781932).

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

155449391540 is a wasteful number, since it uses less digits than its factorization.

155449391540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11248847 (or 11248845 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 50.

The spelling of 155449391540 in words is "one hundred fifty-five billion, four hundred forty-nine million, three hundred ninety-one thousand, five hundred forty".