1916565157 has 4 divisors (see below), whose sum is σ = 2063993260. Its totient is φ = 1769137056.

The previous prime is 1916565151. The next prime is 1916565181. The reversal of 1916565157 is 7515656191.

It is a happy number.

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 187169761 + 1729395396 = 13681^2 + 41586^2 .

It is a cyclic number.

It is not a de Polignac number, because 1916565157 - 2³ = 1916565149 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 (1916565151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73714032 + ... + 73714057.

It is an arithmetic number, because the mean of its divisors is an integer number (515998315).

Almost surely, 2^1916565157 is an apocalyptic number.

It is an amenable number.

1916565157 is a deficient number, since it is larger than the sum of its proper divisors (147428103).

1916565157 is a wasteful number, since it uses less digits than its factorization.

1916565157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147428102.

The product of its digits is 283500, while the sum is 46.

The square root of 1916565157 is about 43778.5924511056. The cubic root of 1916565157 is about 1242.1513894186.

The spelling of 1916565157 in words is "one billion, nine hundred sixteen million, five hundred sixty-five thousand, one hundred fifty-seven".