4061221965 has 12 divisors (see below), whose sum is σ = 7039451484. Its totient is φ = 2165985024.

The previous prime is 4061221963. The next prime is 4061222027. The reversal of 4061221965 is 5691221604.

It can be written as a sum of positive squares in 2 ways, for example, as 2803384809 + 1257837156 = 52947^2 + 35466^2 .

It is not a de Polignac number, because 4061221965 - 2¹ = 4061221963 is a prime.

It is a super-2 number, since 2×4061221965² = 32987047697996922450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4061221961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45124644 + ... + 45124733.

It is an arithmetic number, because the mean of its divisors is an integer number (586620957).

Almost surely, 2^4061221965 is an apocalyptic number.

4061221965 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4061221965 is a deficient number, since it is larger than the sum of its proper divisors (2978229519).

4061221965 is a wasteful number, since it uses less digits than its factorization.

4061221965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90249388 (or 90249385 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 4061221965 is about 63727.7173998881. The cubic root of 4061221965 is about 1595.4587327782.

The spelling of 4061221965 in words is "four billion, sixty-one million, two hundred twenty-one thousand, nine hundred sixty-five".