1664414377 has 4 divisors (see below), whose sum is σ = 1664840016. Its totient is φ = 1663988740.

The previous prime is 1664414347. The next prime is 1664414399. The reversal of 1664414377 is 7734144661.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7734144661 = 181 ⋅42730081.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664414377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1664414317) 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, 206899 + ... + 214792.

It is an arithmetic number, because the mean of its divisors is an integer number (416210004).

Almost surely, 2^1664414377 is an apocalyptic number.

It is an amenable number.

1664414377 is a deficient number, since it is larger than the sum of its proper divisors (425639).

1664414377 is an equidigital number, since it uses as much as digits as its factorization.

1664414377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425638.

The product of its digits is 338688, while the sum is 43.

The square root of 1664414377 is about 40797.2349185579. The cubic root of 1664414377 is about 1185.0967838010.

The spelling of 1664414377 in words is "one billion, six hundred sixty-four million, four hundred fourteen thousand, three hundred seventy-seven".