155550553 has 4 divisors (see below), whose sum is σ = 159754660. Its totient is φ = 151346448.

The previous prime is 155550547. The next prime is 155550557. The reversal of 155550553 is 355055551.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 355055551 = 127 ⋅2795713.

It can be written as a sum of positive squares in 2 ways, for example, as 144072009 + 11478544 = 12003^2 + 3388^2 .

It is a cyclic number.

It is not a de Polignac number, because 155550553 - 2⁹ = 155550041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155550557) 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, 2101998 + ... + 2102071.

It is an arithmetic number, because the mean of its divisors is an integer number (39938665).

Almost surely, 2^155550553 is an apocalyptic number.

It is an amenable number.

155550553 is a deficient number, since it is larger than the sum of its proper divisors (4204107).

155550553 is an equidigital number, since it uses as much as digits as its factorization.

155550553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4204106.

The product of its (nonzero) digits is 46875, while the sum is 34.

The square root of 155550553 is about 12471.9907392525. The cubic root of 155550553 is about 537.8037834227.

The spelling of 155550553 in words is "one hundred fifty-five million, five hundred fifty thousand, five hundred fifty-three".