1949661568 has 16 divisors (see below), whose sum is σ = 3884091660. Its totient is φ = 974830720.

The previous prime is 1949661563. The next prime is 1949661569. The reversal of 1949661568 is 8651669491.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1949661563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7615738 + ... + 7615993.

Almost surely, 2^1949661568 is an apocalyptic number.

It is an amenable number.

1949661568 is a deficient number, since it is larger than the sum of its proper divisors (1934430092).

1949661568 is an equidigital number, since it uses as much as digits as its factorization.

1949661568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15231745 (or 15231733 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 55.

The square root of 1949661568 is about 44154.9721775476. The cubic root of 1949661568 is about 1249.2606973381.

The spelling of 1949661568 in words is "one billion, nine hundred forty-nine million, six hundred sixty-one thousand, five hundred sixty-eight".