1966922557 has 2 divisors, whose sum is σ = 1966922558. Its totient is φ = 1966922556.

The previous prime is 1966922543. The next prime is 1966922569. The reversal of 1966922557 is 7552296691.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1694639556 + 272283001 = 41166^2 + 16501^2 .

It is a cyclic number.

It is not a de Polignac number, because 1966922557 - 2⁷ = 1966922429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1966922597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 983461278 + 983461279.

It is an arithmetic number, because the mean of its divisors is an integer number (983461279).

Almost surely, 2^1966922557 is an apocalyptic number.

It is an amenable number.

1966922557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1966922557 is an equidigital number, since it uses as much as digits as its factorization.

1966922557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 52.

The square root of 1966922557 is about 44350.0006426156. Note that the first 3 decimals coincide. The cubic root of 1966922557 is about 1252.9365746478.

The spelling of 1966922557 in words is "one billion, nine hundred sixty-six million, nine hundred twenty-two thousand, five hundred fifty-seven".