1555644116 has 24 divisors (see below), whose sum is σ = 2938452384. Its totient is φ = 716358240.

The previous prime is 1555644113. The next prime is 1555644137. The reversal of 1555644116 is 6114465551.

It is a self number, because there is not a number n which added to its sum of digits gives 1555644116.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555644113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10730 + ... + 56801.

It is an arithmetic number, because the mean of its divisors is an integer number (122435516).

Almost surely, 2^1555644116 is an apocalyptic number.

It is an amenable number.

1555644116 is a deficient number, since it is larger than the sum of its proper divisors (1382808268).

1555644116 is a wasteful number, since it uses less digits than its factorization.

1555644116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67991 (or 67989 counting only the distinct ones).

The product of its digits is 72000, while the sum is 38.

The square root of 1555644116 is about 39441.6545798981. The cubic root of 1555644116 is about 1158.6975363400.

The spelling of 1555644116 in words is "one billion, five hundred fifty-five million, six hundred forty-four thousand, one hundred sixteen".