155381561131896 has 576 divisors, whose sum is σ = 499584968887680. Its totient is φ = 43245730344960.

The previous prime is 155381561131891. The next prime is 155381561131897. The reversal of 155381561131896 is 698131165183551.

It is a happy number.

155381561131896 is a `hidden beast` number, since 1 + 5 + 5 + 3 + 8 + 1 + 5 + 611 + 3 + 1 + 8 + 9 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155381561131891) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 1640850726 + ... + 1640945418.

It is an arithmetic number, because the mean of its divisors is an integer number (867335015430).

Almost surely, 2^{155381561131896} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155381561131896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249792484443840).

155381561131896 is an abundant number, since it is smaller than the sum of its proper divisors (344203407755784).

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

155381561131896 is a wasteful number, since it uses less digits than its factorization.

155381561131896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94924 (or 94900 counting only the distinct ones).

The product of its digits is 23328000, while the sum is 63.

The spelling of 155381561131896 in words is "one hundred fifty-five trillion, three hundred eighty-one billion, five hundred sixty-one million, one hundred thirty-one thousand, eight hundred ninety-six".