1565664655 has 4 divisors (see below), whose sum is σ = 1878797592. Its totient is φ = 1252531720.

The previous prime is 1565664649. The next prime is 1565664677. The reversal of 1565664655 is 5564665651.

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

It is not a de Polignac number, because 1565664655 - 2³ = 1565664647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1565664599 and 1565664608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 156566461 + ... + 156566470.

It is an arithmetic number, because the mean of its divisors is an integer number (469699398).

Almost surely, 2^1565664655 is an apocalyptic number.

1565664655 is a deficient number, since it is larger than the sum of its proper divisors (313132937).

1565664655 is an equidigital number, since it uses as much as digits as its factorization.

1565664655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313132936.

The product of its digits is 3240000, while the sum is 49.

The square root of 1565664655 is about 39568.4805748212. The cubic root of 1565664655 is about 1161.1800948834.

The spelling of 1565664655 in words is "one billion, five hundred sixty-five million, six hundred sixty-four thousand, six hundred fifty-five".