1905755668 has 12 divisors (see below), whose sum is σ = 3368093652. Its totient is φ = 943443200.

The previous prime is 1905755629. The next prime is 1905755669. The reversal of 1905755668 is 8665575091.

It can be written as a sum of positive squares in 2 ways, for example, as 1013658244 + 892097424 = 31838^2 + 29868^2 .

It is a super-2 number, since 2×1905755668² = 7263809332228252448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1905755669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2358205 + ... + 2359012.

It is an arithmetic number, because the mean of its divisors is an integer number (280674471).

Almost surely, 2^1905755668 is an apocalyptic number.

It is an amenable number.

1905755668 is a deficient number, since it is larger than the sum of its proper divisors (1462337984).

1905755668 is a wasteful number, since it uses less digits than its factorization.

1905755668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4717322 (or 4717320 counting only the distinct ones).

The product of its (nonzero) digits is 2268000, while the sum is 52.

The square root of 1905755668 is about 43654.9615507791. The cubic root of 1905755668 is about 1239.8117273989.

The spelling of 1905755668 in words is "one billion, nine hundred five million, seven hundred fifty-five thousand, six hundred sixty-eight".