1996565761 has 4 divisors (see below), whose sum is σ = 2083372992. Its totient is φ = 1909758532.

The previous prime is 1996565759. The next prime is 1996565869. The reversal of 1996565761 is 1675656991.

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.

It is a cyclic number.

It is not a de Polignac number, because 1996565761 - 2¹ = 1996565759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1996515761) 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, 43403581 + ... + 43403626.

It is an arithmetic number, because the mean of its divisors is an integer number (520843248).

Almost surely, 2^1996565761 is an apocalyptic number.

It is an amenable number.

1996565761 is a deficient number, since it is larger than the sum of its proper divisors (86807231).

1996565761 is an equidigital number, since it uses as much as digits as its factorization.

1996565761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86807230.

The product of its digits is 3061800, while the sum is 55.

The square root of 1996565761 is about 44682.9470939418. The cubic root of 1996565761 is about 1259.1994917355.

The spelling of 1996565761 in words is "one billion, nine hundred ninety-six million, five hundred sixty-five thousand, seven hundred sixty-one".