155356421136 has 640 divisors, whose sum is σ = 537062768640. Its totient is φ = 37623398400.

The previous prime is 155356421131. The next prime is 155356421203. The reversal of 155356421136 is 631124653551.

It is a happy number.

155356421136 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (155356421131) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 205226070 + ... + 205226826.

It is an arithmetic number, because the mean of its divisors is an integer number (839160576).

Almost surely, 2^155356421136 is an apocalyptic number.

155356421136 is a gapful number since it is divisible by the number (16) 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 155356421136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (268531384320).

155356421136 is an abundant number, since it is smaller than the sum of its proper divisors (381706347504).

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

155356421136 is a wasteful number, since it uses less digits than its factorization.

155356421136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 903 (or 897 counting only the distinct ones).

The product of its digits is 324000, while the sum is 42.

The spelling of 155356421136 in words is "one hundred fifty-five billion, three hundred fifty-six million, four hundred twenty-one thousand, one hundred thirty-six".