1970778266 has 4 divisors (see below), whose sum is σ = 2956167402. Its totient is φ = 985389132.

The previous prime is 1970778233. The next prime is 1970778343. The reversal of 1970778266 is 6628770791.

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

It can be written as a sum of positive squares in only one way, i.e., 1075512025 + 895266241 = 32795^2 + 29921^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492694565 + ... + 492694568.

Almost surely, 2^1970778266 is an apocalyptic number.

1970778266 is a deficient number, since it is larger than the sum of its proper divisors (985389136).

1970778266 is an equidigital number, since it uses as much as digits as its factorization.

1970778266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985389135.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The square root of 1970778266 is about 44393.4484580777. The cubic root of 1970778266 is about 1253.7547403273.

The spelling of 1970778266 in words is "one billion, nine hundred seventy million, seven hundred seventy-eight thousand, two hundred sixty-six".