155401521500 has 48 divisors (see below), whose sum is σ = 339767238720. Its totient is φ = 62092785600.

The previous prime is 155401521461. The next prime is 155401521559. The reversal of 155401521500 is 5125104551.

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 15 ways as a sum of consecutive naturals, for example, 290402 + ... + 628598.

It is an arithmetic number, because the mean of its divisors is an integer number (7078484140).

Almost surely, 2^155401521500 is an apocalyptic number.

155401521500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155401521500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169883619360).

155401521500 is an abundant number, since it is smaller than the sum of its proper divisors (184365717220).

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

155401521500 is a wasteful number, since it uses less digits than its factorization.

155401521500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339135 (or 339123 counting only the distinct ones).

The product of its (nonzero) digits is 5000, while the sum is 29.

The spelling of 155401521500 in words is "one hundred fifty-five billion, four hundred one million, five hundred twenty-one thousand, five hundred".