1636775968 has 12 divisors (see below), whose sum is σ = 3222402750. Its totient is φ = 818387968.

The previous prime is 1636775953. The next prime is 1636775969. The reversal of 1636775968 is 8695776361.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1382947344 + 253828624 = 37188^2 + 15932^2 .

It is not an unprimeable number, because it can be changed into a prime (1636775969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25574593 + ... + 25574656.

Almost surely, 2^1636775968 is an apocalyptic number.

It is an amenable number.

1636775968 is a deficient number, since it is larger than the sum of its proper divisors (1585626782).

1636775968 is an equidigital number, since it uses as much as digits as its factorization.

1636775968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51149259 (or 51149251 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 58.

The square root of 1636775968 is about 40457.0879822065. The cubic root of 1636775968 is about 1178.5004335382.

The spelling of 1636775968 in words is "one billion, six hundred thirty-six million, seven hundred seventy-five thousand, nine hundred sixty-eight".