1553997600 has 108 divisors (see below), whose sum is σ = 5479809426. Its totient is φ = 414397440.

The previous prime is 1553997589. The next prime is 1553997677. The reversal of 1553997600 is 67993551.

1553997600 is a `hidden beast` number, since 1 + 5 + 5 + 39 + 9 + 7 + 600 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 1307256336 + 246741264 = 36156^2 + 15708^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 100717 + ... + 115116.

Almost surely, 2^1553997600 is an apocalyptic number.

1553997600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1553997600 is an abundant number, since it is smaller than the sum of its proper divisors (3925811826).

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

1553997600 is a wasteful number, since it uses less digits than its factorization.

1553997600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215859 (or 215843 counting only the distinct ones).

The product of its (nonzero) digits is 255150, while the sum is 45.

The square root of 1553997600 is about 39420.7762480649. The cubic root of 1553997600 is about 1158.2885980112.

The spelling of 1553997600 in words is "one billion, five hundred fifty-three million, nine hundred ninety-seven thousand, six hundred".