1664455500277 has 4 divisors (see below), whose sum is σ = 1676604810636. Its totient is φ = 1652306189920.

The previous prime is 1664455500271. The next prime is 1664455500313. The reversal of 1664455500277 is 7720055544661.

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 528421409476 + 1136034090801 = 726926^2 + 1065849^2 .

It is a cyclic number.

It is not a de Polignac number, because 1664455500277 - 2²³ = 1664447111669 is a prime.

It is a super-2 number, since 2×1664455500277² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1664455500271) 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, 6074654974 + ... + 6074655247.

It is an arithmetic number, because the mean of its divisors is an integer number (419151202659).

Almost surely, 2^{1664455500277} is an apocalyptic number.

It is an amenable number.

1664455500277 is a deficient number, since it is larger than the sum of its proper divisors (12149310359).

1664455500277 is a wasteful number, since it uses less digits than its factorization.

1664455500277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12149310358.

The product of its (nonzero) digits is 7056000, while the sum is 52.

The spelling of 1664455500277 in words is "one trillion, six hundred sixty-four billion, four hundred fifty-five million, five hundred thousand, two hundred seventy-seven".