3663450981 has 6 divisors (see below), whose sum is σ = 5291651430. Its totient is φ = 2442300648.

The previous prime is 3663450979. The next prime is 3663451003. The reversal of 3663450981 is 1890543663.

3663450981 is a `hidden beast` number, since 3 + 6 + 63 + 4 + 509 + 81 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2486617956 + 1176833025 = 49866^2 + 34305^2 .

It is not a de Polignac number, because 3663450981 - 2¹ = 3663450979 is a prime.

It is a super-2 number, since 2×3663450981² = 26841746180379724722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3663450181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 203525046 + ... + 203525063.

It is an arithmetic number, because the mean of its divisors is an integer number (881941905).

Almost surely, 2^3663450981 is an apocalyptic number.

It is an amenable number.

3663450981 is a deficient number, since it is larger than the sum of its proper divisors (1628200449).

3663450981 is a wasteful number, since it uses less digits than its factorization.

3663450981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407050115 (or 407050112 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 3663450981 is about 60526.4486071998. The cubic root of 3663450981 is about 1541.5707508842.

The spelling of 3663450981 in words is "three billion, six hundred sixty-three million, four hundred fifty thousand, nine hundred eighty-one".