1555661112 has 64 divisors (see below), whose sum is σ = 3925393920. Its totient is φ = 513744768.

The previous prime is 1555661111. The next prime is 1555661113. The reversal of 1555661112 is 2111665551.

It is an interprime number because it is at equal distance from previous prime (1555661111) and next prime (1555661113).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555661111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1951498 + ... + 1952294.

It is an arithmetic number, because the mean of its divisors is an integer number (61334280).

Almost surely, 2^1555661112 is an apocalyptic number.

1555661112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1555661112 is an abundant number, since it is smaller than the sum of its proper divisors (2369732808).

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

1555661112 is a wasteful number, since it uses less digits than its factorization.

1555661112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460 (or 1456 counting only the distinct ones).

The product of its digits is 9000, while the sum is 33.

The square root of 1555661112 is about 39441.8700368023. The cubic root of 1555661112 is about 1158.7017560608.

The spelling of 1555661112 in words is "one billion, five hundred fifty-five million, six hundred sixty-one thousand, one hundred twelve".