1553666481 has 16 divisors (see below), whose sum is σ = 2304001920. Its totient is φ = 1034754480.

The previous prime is 1553666473. The next prime is 1553666483. The reversal of 1553666481 is 1846663551.

It is not a de Polignac number, because 1553666481 - 2³ = 1553666473 is a prime.

It is a super-2 number, since 2×1553666481² = 4827759068365846722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1553666483) 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, 70 + ... + 55743.

It is an arithmetic number, because the mean of its divisors is an integer number (144000120).

Almost surely, 2^1553666481 is an apocalyptic number.

It is an amenable number.

1553666481 is a deficient number, since it is larger than the sum of its proper divisors (750335439).

1553666481 is a wasteful number, since it uses less digits than its factorization.

1553666481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56853 (or 56847 counting only the distinct ones).

The product of its digits is 518400, while the sum is 45.

The square root of 1553666481 is about 39416.5762211788. The cubic root of 1553666481 is about 1158.2063244809.

The spelling of 1553666481 in words is "one billion, five hundred fifty-three million, six hundred sixty-six thousand, four hundred eighty-one".