663101557 has 4 divisors (see below), whose sum is σ = 664772236. Its totient is φ = 661430880.

The previous prime is 663101519. The next prime is 663101567. The reversal of 663101557 is 755101366.

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 584140561 + 78960996 = 24169^2 + 8886^2 .

It is a cyclic number.

It is not a de Polignac number, because 663101557 - 2⁷ = 663101429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663101567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834744 + ... + 835537.

It is an arithmetic number, because the mean of its divisors is an integer number (166193059).

Almost surely, 2^663101557 is an apocalyptic number.

It is an amenable number.

663101557 is a deficient number, since it is larger than the sum of its proper divisors (1670679).

663101557 is a wasteful number, since it uses less digits than its factorization.

663101557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670678.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 663101557 is about 25750.7583771818. The cubic root of 663101557 is about 872.0204755769.

The spelling of 663101557 in words is "six hundred sixty-three million, one hundred one thousand, five hundred fifty-seven".