61099093817 has 2 divisors, whose sum is σ = 61099093818. Its totient is φ = 61099093816.

The previous prime is 61099093777. The next prime is 61099093879. The reversal of 61099093817 is 71839099016.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38234327296 + 22864766521 = 195536^2 + 151211^2 .

It is a cyclic number.

It is not a de Polignac number, because 61099093817 - 2⁶ = 61099093753 is a prime.

It is not a weakly prime, because it can be changed into another prime (61099053817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30549546908 + 30549546909.

It is an arithmetic number, because the mean of its divisors is an integer number (30549546909).

Almost surely, 2^61099093817 is an apocalyptic number.

It is an amenable number.

61099093817 is a deficient number, since it is larger than the sum of its proper divisors (1).

61099093817 is an equidigital number, since it uses as much as digits as its factorization.

61099093817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 734832, while the sum is 53.

The spelling of 61099093817 in words is "sixty-one billion, ninety-nine million, ninety-three thousand, eight hundred seventeen".