1565056357 has 4 divisors (see below), whose sum is σ = 1565672416. Its totient is φ = 1564440300.

The previous prime is 1565056351. The next prime is 1565056379. The reversal of 1565056357 is 7536505651.

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: 7536505651 = 41 ⋅183817211.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1565056357 is a prime.

It is a super-2 number, since 2×1565056357² = 4898802801172222898, which 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 (1565056351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304203 + ... + 309304.

It is an arithmetic number, because the mean of its divisors is an integer number (391418104).

Almost surely, 2^1565056357 is an apocalyptic number.

It is an amenable number.

1565056357 is a deficient number, since it is larger than the sum of its proper divisors (616059).

1565056357 is an equidigital number, since it uses as much as digits as its factorization.

1565056357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616058.

The product of its (nonzero) digits is 472500, while the sum is 43.

The square root of 1565056357 is about 39560.7931796116. The cubic root of 1565056357 is about 1161.0296933646.

The spelling of 1565056357 in words is "one billion, five hundred sixty-five million, fifty-six thousand, three hundred fifty-seven".