1553442561 has 48 divisors (see below), whose sum is σ = 2512036800. Its totient is φ = 917055360.

The previous prime is 1553442551. The next prime is 1553442571. The reversal of 1553442561 is 1652443551.

1553442561 is a `hidden beast` number, since 1 + 5 + 53 + 4 + 42 + 561 = 666.

It is an interprime number because it is at equal distance from previous prime (1553442551) and next prime (1553442571).

It is not a de Polignac number, because 1553442561 - 2⁶ = 1553442497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1553442551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 780810 + ... + 782796.

It is an arithmetic number, because the mean of its divisors is an integer number (52334100).

Almost surely, 2^1553442561 is an apocalyptic number.

1553442561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1553442561 is a deficient number, since it is larger than the sum of its proper divisors (958594239).

1553442561 is a wasteful number, since it uses less digits than its factorization.

1553442561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2206 (or 2203 counting only the distinct ones).

The product of its digits is 72000, while the sum is 36.

The square root of 1553442561 is about 39413.7356894776. The cubic root of 1553442561 is about 1158.1506801876.

The spelling of 1553442561 in words is "one billion, five hundred fifty-three million, four hundred forty-two thousand, five hundred sixty-one".