1565166642 has 64 divisors (see below), whose sum is σ = 3593528064. Its totient is φ = 450201600.

The previous prime is 1565166623. The next prime is 1565166661. The reversal of 1565166642 is 2466615651.

It is an interprime number because it is at equal distance from previous prime (1565166623) and next prime (1565166661).

It is a junction number, because it is equal to n+sod(n) for n = 1565166594 and 1565166603.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196318 + ... + 204134.

It is an arithmetic number, because the mean of its divisors is an integer number (56148876).

Almost surely, 2^1565166642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1565166642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1796764032).

1565166642 is an abundant number, since it is smaller than the sum of its proper divisors (2028361422).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1565166642 is a wasteful number, since it uses less digits than its factorization.

1565166642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8003.

The product of its digits is 259200, while the sum is 42.

The square root of 1565166642 is about 39562.1870224587. The cubic root of 1565166642 is about 1161.0569641934.

The spelling of 1565166642 in words is "one billion, five hundred sixty-five million, one hundred sixty-six thousand, six hundred forty-two".