61408804823 has 2 divisors, whose sum is σ = 61408804824. Its totient is φ = 61408804822.

The previous prime is 61408804811. The next prime is 61408804939. The reversal of 61408804823 is 32840880416.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61408804823 - 2²⁰ = 61407756247 is a prime.

It is a super-2 number, since 2×61408804823² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61408804123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30704402411 + 30704402412.

It is an arithmetic number, because the mean of its divisors is an integer number (30704402412).

Almost surely, 2^61408804823 is an apocalyptic number.

61408804823 is a deficient number, since it is larger than the sum of its proper divisors (1).

61408804823 is an equidigital number, since it uses as much as digits as its factorization.

61408804823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294912, while the sum is 44.

The spelling of 61408804823 in words is "sixty-one billion, four hundred eight million, eight hundred four thousand, eight hundred twenty-three".