155640555532 has 288 divisors, whose sum is σ = 381157358400. Its totient is φ = 54731980800.

The previous prime is 155640555493. The next prime is 155640555533. The reversal of 155640555532 is 235555046551.

It is not an unprimeable number, because it can be changed into a prime (155640555533) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 192385944 + ... + 192386752.

It is an arithmetic number, because the mean of its divisors is an integer number (1323463050).

Almost surely, 2^155640555532 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 155640555532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190578679200).

155640555532 is an abundant number, since it is smaller than the sum of its proper divisors (225516802868).

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

155640555532 is a wasteful number, since it uses less digits than its factorization.

155640555532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065 (or 1056 counting only the distinct ones).

The product of its (nonzero) digits is 2250000, while the sum is 46.

The spelling of 155640555532 in words is "one hundred fifty-five billion, six hundred forty million, five hundred fifty-five thousand, five hundred thirty-two".