63126661 has 8 divisors (see below), whose sum is σ = 71981784. Its totient is φ = 54842880.

The previous prime is 63126647. The next prime is 63126667. The reversal of 63126661 is 16662136.

63126661 = T₂₉₈ + T₂₉₉ + ... + T₇₃₉.

63126661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1425636 + 61701025 = 1194^2 + 7855^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 63126661 - 2¹⁵ = 63093893 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 (63126667) 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 7 ways as a sum of consecutive naturals, for example, 142600 + ... + 143041.

It is an arithmetic number, because the mean of its divisors is an integer number (8997723).

Almost surely, 2^63126661 is an apocalyptic number.

It is an amenable number.

63126661 is a deficient number, since it is larger than the sum of its proper divisors (8855123).

63126661 is a wasteful number, since it uses less digits than its factorization.

63126661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285671.

The product of its digits is 7776, while the sum is 31.

The square root of 63126661 is about 7945.2288198642. The cubic root of 63126661 is about 398.1722043795.

Adding to 63126661 its reverse (16662136), we get a palindrome (79788797).

The spelling of 63126661 in words is "sixty-three million, one hundred twenty-six thousand, six hundred sixty-one".