1556155146 has 128 divisors (see below), whose sum is σ = 4075868160. Its totient is φ = 384371712.

The previous prime is 1556155141. The next prime is 1556155171. The reversal of 1556155146 is 6415516551.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1556155141) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3332005 + ... + 3332471.

It is an arithmetic number, because the mean of its divisors is an integer number (31842720).

Almost surely, 2^1556155146 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1556155146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2037934080).

1556155146 is an abundant number, since it is smaller than the sum of its proper divisors (2519713014).

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

1556155146 is a wasteful number, since it uses less digits than its factorization.

1556155146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868.

The product of its digits is 90000, while the sum is 39.

The square root of 1556155146 is about 39448.1323512280. The cubic root of 1556155146 is about 1158.8244000550.

It can be divided in two parts, 15561 and 55146, that added together give a palindrome (70707).

The spelling of 1556155146 in words is "one billion, five hundred fifty-six million, one hundred fifty-five thousand, one hundred forty-six".