66354105601 has 4 divisors (see below), whose sum is σ = 75833263552. Its totient is φ = 56874947652.

The previous prime is 66354105583. The next prime is 66354105617. The reversal of 66354105601 is 10650145366.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66354105601 - 2¹³ = 66354097409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66354105401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4739578965 + ... + 4739578978.

It is an arithmetic number, because the mean of its divisors is an integer number (18958315888).

Almost surely, 2^66354105601 is an apocalyptic number.

It is an amenable number.

66354105601 is a deficient number, since it is larger than the sum of its proper divisors (9479157951).

66354105601 is an equidigital number, since it uses as much as digits as its factorization.

66354105601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9479157950.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 66354105601 in words is "sixty-six billion, three hundred fifty-four million, one hundred five thousand, six hundred one".