2065761557 has 4 divisors (see below), whose sum is σ = 2065911276. Its totient is φ = 2065611840.

The previous prime is 2065761547. The next prime is 2065761563. The reversal of 2065761557 is 7551675602.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1918527601 + 147233956 = 43801^2 + 12134^2 .

It is a cyclic number.

It is not a de Polignac number, because 2065761557 - 2¹⁰ = 2065760533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2065761547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51794 + ... + 82547.

It is an arithmetic number, because the mean of its divisors is an integer number (516477819).

Almost surely, 2^2065761557 is an apocalyptic number.

It is an amenable number.

2065761557 is a deficient number, since it is larger than the sum of its proper divisors (149719).

2065761557 is a wasteful number, since it uses less digits than its factorization.

2065761557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149718.

The product of its (nonzero) digits is 441000, while the sum is 44.

The square root of 2065761557 is about 45450.6496873257. The cubic root of 2065761557 is about 1273.5814662143.

The spelling of 2065761557 in words is "two billion, sixty-five million, seven hundred sixty-one thousand, five hundred fifty-seven".