61530293809 has 2 divisors, whose sum is σ = 61530293810. Its totient is φ = 61530293808.

The previous prime is 61530293771. The next prime is 61530293821. The reversal of 61530293809 is 90839203516.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58399555600 + 3130738209 = 241660^2 + 55953^2 .

It is a cyclic number.

It is not a de Polignac number, because 61530293809 - 2¹¹ = 61530291761 is a prime.

It is not a weakly prime, because it can be changed into another prime (61530293309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30765146904 + 30765146905.

It is an arithmetic number, because the mean of its divisors is an integer number (30765146905).

Almost surely, 2^61530293809 is an apocalyptic number.

It is an amenable number.

61530293809 is a deficient number, since it is larger than the sum of its proper divisors (1).

61530293809 is an equidigital number, since it uses as much as digits as its factorization.

61530293809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 349920, while the sum is 46.

The spelling of 61530293809 in words is "sixty-one billion, five hundred thirty million, two hundred ninety-three thousand, eight hundred nine".