1552365561 has 4 divisors (see below), whose sum is σ = 2069820752. Its totient is φ = 1034910372.

The previous prime is 1552365559. The next prime is 1552365631. The reversal of 1552365561 is 1655632551.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1552365561 - 2¹ = 1552365559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1552365511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258727591 + ... + 258727596.

It is an arithmetic number, because the mean of its divisors is an integer number (517455188).

Almost surely, 2^1552365561 is an apocalyptic number.

It is an amenable number.

1552365561 is a deficient number, since it is larger than the sum of its proper divisors (517455191).

1552365561 is an equidigital number, since it uses as much as digits as its factorization.

1552365561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517455190.

The product of its digits is 135000, while the sum is 39.

The square root of 1552365561 is about 39400.0705710028. The cubic root of 1552365561 is about 1157.8829701174.

The spelling of 1552365561 in words is "one billion, five hundred fifty-two million, three hundred sixty-five thousand, five hundred sixty-one".