553661557 has 4 divisors (see below), whose sum is σ = 553795756. Its totient is φ = 553527360.

The previous prime is 553661527. The next prime is 553661561. The reversal of 553661557 is 755166355.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 395254161 + 158407396 = 19881^2 + 12586^2 .

It is a cyclic number.

It is not a de Polignac number, because 553661557 - 2⁷ = 553661429 is a prime.

It is a super-2 number, since 2×553661557² = 613082239399328498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (553661527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60708 + ... + 69229.

It is an arithmetic number, because the mean of its divisors is an integer number (138448939).

Almost surely, 2^553661557 is an apocalyptic number.

It is an amenable number.

553661557 is a deficient number, since it is larger than the sum of its proper divisors (134199).

553661557 is a wasteful number, since it uses less digits than its factorization.

553661557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134198.

The product of its digits is 472500, while the sum is 43.

The square root of 553661557 is about 23530.0139608968. The cubic root of 553661557 is about 821.1354273823.

The spelling of 553661557 in words is "five hundred fifty-three million, six hundred sixty-one thousand, five hundred fifty-seven".