64661411998 has 16 divisors (see below), whose sum is σ = 100345937760. Its totient is φ = 31212972000.

The previous prime is 64661411993. The next prime is 64661412017. The reversal of 64661411998 is 89911416646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64661411993) 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, 668143 + ... + 758773.

It is an arithmetic number, because the mean of its divisors is an integer number (6271621110).

Almost surely, 2^64661411998 is an apocalyptic number.

64661411998 is a deficient number, since it is larger than the sum of its proper divisors (35684525762).

64661411998 is a wasteful number, since it uses less digits than its factorization.

64661411998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102963.

The product of its digits is 2239488, while the sum is 55.

The spelling of 64661411998 in words is "sixty-four billion, six hundred sixty-one million, four hundred eleven thousand, nine hundred ninety-eight".