1565442645 has 16 divisors (see below), whose sum is σ = 2697378432. Its totient is φ = 770679360.

The previous prime is 1565442643. The next prime is 1565442667. The reversal of 1565442645 is 5462445651.

It is not a de Polignac number, because 1565442645 - 2¹ = 1565442643 is a prime.

It is a super-2 number, since 2×1565442645² = 4901221349569192050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1565442597 and 1565442606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1565442643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4013761 + ... + 4014150.

It is an arithmetic number, because the mean of its divisors is an integer number (168586152).

Almost surely, 2^1565442645 is an apocalyptic number.

1565442645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1565442645 is a deficient number, since it is larger than the sum of its proper divisors (1131935787).

1565442645 is a wasteful number, since it uses less digits than its factorization.

1565442645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8027932.

The product of its digits is 576000, while the sum is 42.

The square root of 1565442645 is about 39565.6750858620. The cubic root of 1565442645 is about 1161.1252074850.

The spelling of 1565442645 in words is "one billion, five hundred sixty-five million, four hundred forty-two thousand, six hundred forty-five".