61999008017 has 2 divisors, whose sum is σ = 61999008018. Its totient is φ = 61999008016.

The previous prime is 61999008011. The next prime is 61999008023. The reversal of 61999008017 is 71080099916.

It is a Cunningham number, because it is equal to 248996²+1.

It is a balanced prime because it is at equal distance from previous prime (61999008011) and next prime (61999008023).

It can be written as a sum of positive squares in only one way, i.e., 61999008016 + 1 = 248996^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 61999008017 - 2²⁶ = 61931899153 is a prime.

It is not a weakly prime, because it can be changed into another prime (61999008011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30999504008 + 30999504009.

It is an arithmetic number, because the mean of its divisors is an integer number (30999504009).

Almost surely, 2^61999008017 is an apocalyptic number.

It is an amenable number.

61999008017 is a deficient number, since it is larger than the sum of its proper divisors (1).

61999008017 is an equidigital number, since it uses as much as digits as its factorization.

61999008017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 244944, while the sum is 50.

The spelling of 61999008017 in words is "sixty-one billion, nine hundred ninety-nine million, eight thousand, seventeen".