33640539649 has 2 divisors, whose sum is σ = 33640539650. Its totient is φ = 33640539648.

The previous prime is 33640539637. The next prime is 33640539671. The reversal of 33640539649 is 94693504633.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27378666225 + 6261873424 = 165465^2 + 79132^2 .

It is a cyclic number.

It is not a de Polignac number, because 33640539649 - 2⁵ = 33640539617 is a prime.

It is a super-2 number, since 2×33640539649² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 33640539596 and 33640539605.

It is not a weakly prime, because it can be changed into another prime (33640539629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16820269824 + 16820269825.

It is an arithmetic number, because the mean of its divisors is an integer number (16820269825).

Almost surely, 2^33640539649 is an apocalyptic number.

It is an amenable number.

33640539649 is a deficient number, since it is larger than the sum of its proper divisors (1).

33640539649 is an equidigital number, since it uses as much as digits as its factorization.

33640539649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6298560, while the sum is 52.

The spelling of 33640539649 in words is "thirty-three billion, six hundred forty million, five hundred thirty-nine thousand, six hundred forty-nine".