63618857 has 2 divisors, whose sum is σ = 63618858. Its totient is φ = 63618856.

The previous prime is 63618829. The next prime is 63618881. The reversal of 63618857 is 75881636.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60155536 + 3463321 = 7756^2 + 1861^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63618857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63618157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31809428 + 31809429.

It is an arithmetic number, because the mean of its divisors is an integer number (31809429).

Almost surely, 2^63618857 is an apocalyptic number.

It is an amenable number.

63618857 is a deficient number, since it is larger than the sum of its proper divisors (1).

63618857 is an equidigital number, since it uses as much as digits as its factorization.

63618857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 63618857 is about 7976.1429901927. The cubic root of 63618857 is about 399.2043705671.

The spelling of 63618857 in words is "sixty-three million, six hundred eighteen thousand, eight hundred fifty-seven".