1664090852971 has 4 divisors (see below), whose sum is σ = 1664220336832. Its totient is φ = 1663961369112.

The previous prime is 1664090852969. The next prime is 1664090852993. The reversal of 1664090852971 is 1792580904661.

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

It is a cyclic number.

It is not a de Polignac number, because 1664090852971 - 2¹ = 1664090852969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664090852951) 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, 64722651 + ... + 64748356.

It is an arithmetic number, because the mean of its divisors is an integer number (416055084208).

Almost surely, 2^{1664090852971} is an apocalyptic number.

1664090852971 is a deficient number, since it is larger than the sum of its proper divisors (129483861).

1664090852971 is a wasteful number, since it uses less digits than its factorization.

1664090852971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129483860.

The product of its (nonzero) digits is 6531840, while the sum is 58.

The spelling of 1664090852971 in words is "one trillion, six hundred sixty-four billion, ninety million, eight hundred fifty-two thousand, nine hundred seventy-one".