1551983616 has 132 divisors (see below), whose sum is σ = 4577943552. Its totient is φ = 506179584.

The previous prime is 1551983599. The next prime is 1551983617. The reversal of 1551983616 is 6163891551.

1551983616 is a `hidden beast` number, since 1 + 551 + 9 + 83 + 6 + 16 = 666.

It is not an unprimeable number, because it can be changed into a prime (1551983617) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 431361 + ... + 434943.

Almost surely, 2^1551983616 is an apocalyptic number.

1551983616 is a gapful number since it is divisible by the number (16) 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 1551983616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2288971776).

1551983616 is an abundant number, since it is smaller than the sum of its proper divisors (3025959936).

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

1551983616 is a wasteful number, since it uses less digits than its factorization.

1551983616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3656 (or 3635 counting only the distinct ones).

The product of its digits is 194400, while the sum is 45.

The square root of 1551983616 is about 39395.2232637410. The cubic root of 1551983616 is about 1157.7880002432.

The spelling of 1551983616 in words is "one billion, five hundred fifty-one million, nine hundred eighty-three thousand, six hundred sixteen".