1990065266 has 32 divisors (see below), whose sum is σ = 3451638528. Its totient is φ = 842895360.

The previous prime is 1990065199. The next prime is 1990065277. The reversal of 1990065266 is 6625600991.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 923246 + ... + 925398.

It is an arithmetic number, because the mean of its divisors is an integer number (107863704).

Almost surely, 2^1990065266 is an apocalyptic number.

1990065266 is a deficient number, since it is larger than the sum of its proper divisors (1461573262).

1990065266 is a wasteful number, since it uses less digits than its factorization.

1990065266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2906.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 1990065266 is about 44610.1475675658. The cubic root of 1990065266 is about 1257.8314226690.

The spelling of 1990065266 in words is "one billion, nine hundred ninety million, sixty-five thousand, two hundred sixty-six".