155047821840 has 240 divisors, whose sum is σ = 557408656896. Its totient is φ = 40012185600.

The previous prime is 155047821793. The next prime is 155047821847. The reversal of 155047821840 is 48128740551.

155047821840 is a `hidden beast` number, since 1 + 550 + 4 + 7 + 82 + 18 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (155047821847) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 474000 + ... + 731280.

Almost surely, 2^155047821840 is an apocalyptic number.

155047821840 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 155047821840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (278704328448).

155047821840 is an abundant number, since it is smaller than the sum of its proper divisors (402360835056).

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

155047821840 is a wasteful number, since it uses less digits than its factorization.

155047821840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257340 (or 257322 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The spelling of 155047821840 in words is "one hundred fifty-five billion, forty-seven million, eight hundred twenty-one thousand, eight hundred forty".