66013898 has 8 divisors (see below), whose sum is σ = 99086592. Its totient is φ = 32985036.

The previous prime is 66013837. The next prime is 66013949. The reversal of 66013898 is 89831066.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6890 + ... + 13397.

It is an arithmetic number, because the mean of its divisors is an integer number (12385824).

Almost surely, 2^66013898 is an apocalyptic number.

66013898 is a deficient number, since it is larger than the sum of its proper divisors (33072694).

66013898 is a wasteful number, since it uses less digits than its factorization.

66013898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21916.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 66013898 is about 8124.8937223819. The cubic root of 66013898 is about 404.1523663107.

The spelling of 66013898 in words is "sixty-six million, thirteen thousand, eight hundred ninety-eight".