61623133309 has 2 divisors, whose sum is σ = 61623133310. Its totient is φ = 61623133308.

The previous prime is 61623133307. The next prime is 61623133339. The reversal of 61623133309 is 90333132616.

61623133309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61604729209 + 18404100 = 248203^2 + 4290^2 .

It is a cyclic number.

It is not a de Polignac number, because 61623133309 - 2¹ = 61623133307 is a prime.

Together with 61623133307, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61623133301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30811566654 + 30811566655.

It is an arithmetic number, because the mean of its divisors is an integer number (30811566655).

Almost surely, 2^61623133309 is an apocalyptic number.

It is an amenable number.

61623133309 is a deficient number, since it is larger than the sum of its proper divisors (1).

61623133309 is an equidigital number, since it uses as much as digits as its factorization.

61623133309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 52488, while the sum is 37.

The spelling of 61623133309 in words is "sixty-one billion, six hundred twenty-three million, one hundred thirty-three thousand, three hundred nine".