66401105601 has 16 divisors (see below), whose sum is σ = 90709557120. Its totient is φ = 43180394880.

The previous prime is 66401105587. The next prime is 66401105629. The reversal of 66401105601 is 10650110466.

It is not a de Polignac number, because 66401105601 - 2⁷ = 66401105473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66401105101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 737635 + ... + 822743.

It is an arithmetic number, because the mean of its divisors is an integer number (5669347320).

Almost surely, 2^66401105601 is an apocalyptic number.

It is an amenable number.

66401105601 is a deficient number, since it is larger than the sum of its proper divisors (24308451519).

66401105601 is a wasteful number, since it uses less digits than its factorization.

66401105601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91496.

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 66401105601 in words is "sixty-six billion, four hundred one million, one hundred five thousand, six hundred one".