155827273440 has 384 divisors, whose sum is σ = 521153740800. Its totient is φ = 39075563520.

The previous prime is 155827273439. The next prime is 155827273457. The reversal of 155827273440 is 44372728551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 155827273440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 152921251 + ... + 152922269.

It is an arithmetic number, because the mean of its divisors is an integer number (1357171200).

Almost surely, 2^155827273440 is an apocalyptic number.

155827273440 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 155827273440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260576870400).

155827273440 is an abundant number, since it is smaller than the sum of its proper divisors (365326467360).

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

155827273440 is a wasteful number, since it uses less digits than its factorization.

155827273440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1350 (or 1342 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 48.

The spelling of 155827273440 in words is "one hundred fifty-five billion, eight hundred twenty-seven million, two hundred seventy-three thousand, four hundred forty".