33947780861 has 2 divisors, whose sum is σ = 33947780862. Its totient is φ = 33947780860.

The previous prime is 33947780849. The next prime is 33947780869. The reversal of 33947780861 is 16808774933.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28158853636 + 5788927225 = 167806^2 + 76085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-33947780861 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 33947780797 and 33947780806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (33947780869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16973890430 + 16973890431.

It is an arithmetic number, because the mean of its divisors is an integer number (16973890431).

Almost surely, 2^33947780861 is an apocalyptic number.

It is an amenable number.

33947780861 is a deficient number, since it is larger than the sum of its proper divisors (1).

33947780861 is an equidigital number, since it uses as much as digits as its factorization.

33947780861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6096384, while the sum is 56.

The spelling of 33947780861 in words is "thirty-three billion, nine hundred forty-seven million, seven hundred eighty thousand, eight hundred sixty-one".