63557121 has 8 divisors (see below), whose sum is σ = 84838720. Its totient is φ = 42323472.

The previous prime is 63557111. The next prime is 63557173. The reversal of 63557121 is 12175536.

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

It is not a de Polignac number, because 63557121 - 2⁵ = 63557089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63557111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8770 + ... + 14283.

It is an arithmetic number, because the mean of its divisors is an integer number (10604840).

Almost surely, 2^63557121 is an apocalyptic number.

It is an amenable number.

63557121 is a deficient number, since it is larger than the sum of its proper divisors (21281599).

63557121 is a wasteful number, since it uses less digits than its factorization.

63557121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23975.

The product of its digits is 6300, while the sum is 30.

The square root of 63557121 is about 7972.2720099103. The cubic root of 63557121 is about 399.0751989219.

The spelling of 63557121 in words is "sixty-three million, five hundred fifty-seven thousand, one hundred twenty-one".