155015454440 has 64 divisors (see below), whose sum is σ = 434848556160. Its totient is φ = 48316504320.

The previous prime is 155015454401. The next prime is 155015454469. The reversal of 155015454440 is 44454510551.

It is a super-2 number, since 2×155015454440² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 155015454394 and 155015454403.

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 15 ways as a sum of consecutive naturals, for example, 25161767 + ... + 25167926.

It is an arithmetic number, because the mean of its divisors is an integer number (6794508690).

Almost surely, 2^155015454440 is an apocalyptic number.

155015454440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155015454440 is an abundant number, since it is smaller than the sum of its proper divisors (279833101720).

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

155015454440 is a wasteful number, since it uses less digits than its factorization.

155015454440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50329722 (or 50329718 counting only the distinct ones).

The product of its (nonzero) digits is 160000, while the sum is 38.

Adding to 155015454440 its reverse (44454510551), we get a palindrome (199469964991).

The spelling of 155015454440 in words is "one hundred fifty-five billion, fifteen million, four hundred fifty-four thousand, four hundred forty".