1965050557 has 4 divisors (see below), whose sum is σ = 1966320700. Its totient is φ = 1963780416.

The previous prime is 1965050543. The next prime is 1965050561. The reversal of 1965050557 is 7550505691.

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 1190319001 + 774731556 = 34501^2 + 27834^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1965050557 is a prime.

It is a super-2 number, since 2×1965050557² = 7722847383132020498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1965053557) 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, 632748 + ... + 635845.

It is an arithmetic number, because the mean of its divisors is an integer number (491580175).

Almost surely, 2^1965050557 is an apocalyptic number.

It is an amenable number.

1965050557 is a deficient number, since it is larger than the sum of its proper divisors (1270143).

1965050557 is a wasteful number, since it uses less digits than its factorization.

1965050557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270142.

The product of its (nonzero) digits is 236250, while the sum is 43.

The square root of 1965050557 is about 44328.8907711438. The cubic root of 1965050557 is about 1252.5389582877.

It can be divided in two parts, 19650 and 50557, that added together give a palindrome (70207).

The spelling of 1965050557 in words is "one billion, nine hundred sixty-five million, fifty thousand, five hundred fifty-seven".