61864808099 has 2 divisors, whose sum is σ = 61864808100. Its totient is φ = 61864808098.

The previous prime is 61864808063. The next prime is 61864808177. The reversal of 61864808099 is 99080846816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61864808099 - 2³² = 57569840803 is a prime.

It is a super-2 number, since 2×61864808099² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61864808009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30932404049 + 30932404050.

It is an arithmetic number, because the mean of its divisors is an integer number (30932404050).

Almost surely, 2^61864808099 is an apocalyptic number.

61864808099 is a deficient number, since it is larger than the sum of its proper divisors (1).

61864808099 is an equidigital number, since it uses as much as digits as its factorization.

61864808099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5971968, while the sum is 59.

The spelling of 61864808099 in words is "sixty-one billion, eight hundred sixty-four million, eight hundred eight thousand, ninety-nine".