2069851561 has 4 divisors (see below), whose sum is σ = 2071180800. Its totient is φ = 2068522324.

The previous prime is 2069851519. The next prime is 2069851571. The reversal of 2069851561 is 1651589602.

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 2069851561 - 2¹⁷ = 2069720489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2069851571) 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, 662281 + ... + 665398.

It is an arithmetic number, because the mean of its divisors is an integer number (517795200).

Almost surely, 2^2069851561 is an apocalyptic number.

It is an amenable number.

2069851561 is a deficient number, since it is larger than the sum of its proper divisors (1329239).

2069851561 is a wasteful number, since it uses less digits than its factorization.

2069851561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329238.

The product of its (nonzero) digits is 129600, while the sum is 43.

The square root of 2069851561 is about 45495.6213387618. The cubic root of 2069851561 is about 1274.4214339753.

The spelling of 2069851561 in words is "two billion, sixty-nine million, eight hundred fifty-one thousand, five hundred sixty-one".