63406561918 has 16 divisors (see below), whose sum is σ = 108736512480. Its totient is φ = 27164353536.

The previous prime is 63406561877. The next prime is 63406561919. The reversal of 63406561918 is 81916560436.

It is a super-2 number, since 2×63406561918² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63406561919) 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, 784023 + ... + 861106.

It is an arithmetic number, because the mean of its divisors is an integer number (6796032030).

Almost surely, 2^63406561918 is an apocalyptic number.

63406561918 is a deficient number, since it is larger than the sum of its proper divisors (45329950562).

63406561918 is a wasteful number, since it uses less digits than its factorization.

63406561918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647891.

The product of its (nonzero) digits is 933120, while the sum is 49.

The spelling of 63406561918 in words is "sixty-three billion, four hundred six million, five hundred sixty-one thousand, nine hundred eighteen".