1966501382401 has 4 divisors (see below), whose sum is σ = 1966508464900. Its totient is φ = 1966494299904.

The previous prime is 1966501382381. The next prime is 1966501382411. The reversal of 1966501382401 is 1042831056691.

It is a Cunningham number, because it is equal to 1402320²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 79727169600 + 1886774212801 = 282360^2 + 1373599^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966501382401 - 2¹¹ = 1966501380353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1966501382411) 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, 3107016 + ... + 3685993.

It is an arithmetic number, because the mean of its divisors is an integer number (491627116225).

Almost surely, 2^{1966501382401} is an apocalyptic number.

It is an amenable number.

1966501382401 is a deficient number, since it is larger than the sum of its proper divisors (7082499).

1966501382401 is an equidigital number, since it uses as much as digits as its factorization.

1966501382401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7082498.

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 1966501382401 in words is "one trillion, nine hundred sixty-six billion, five hundred one million, three hundred eighty-two thousand, four hundred one".