1553738555 has 4 divisors (see below), whose sum is σ = 1864486272. Its totient is φ = 1242990840.

The previous prime is 1553738551. The next prime is 1553738561. The reversal of 1553738555 is 5558373551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5558373551 = 457 ⋅12162743.

It is not a de Polignac number, because 1553738555 - 2² = 1553738551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1553738551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155373851 + ... + 155373860.

It is an arithmetic number, because the mean of its divisors is an integer number (466121568).

Almost surely, 2^1553738555 is an apocalyptic number.

1553738555 is a deficient number, since it is larger than the sum of its proper divisors (310747717).

1553738555 is an equidigital number, since it uses as much as digits as its factorization.

1553738555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310747716.

The product of its digits is 1575000, while the sum is 47.

The square root of 1553738555 is about 39417.4904706020. The cubic root of 1553738555 is about 1158.2242337883.

The spelling of 1553738555 in words is "one billion, five hundred fifty-three million, seven hundred thirty-eight thousand, five hundred fifty-five".