61000005559 has 2 divisors, whose sum is σ = 61000005560. Its totient is φ = 61000005558.

The previous prime is 61000005491. The next prime is 61000005607. The reversal of 61000005559 is 95550000016.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61000005559 - 2⁷ = 61000005431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61000005559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61000005959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30500002779 + 30500002780.

It is an arithmetic number, because the mean of its divisors is an integer number (30500002780).

Almost surely, 2^61000005559 is an apocalyptic number.

61000005559 is a deficient number, since it is larger than the sum of its proper divisors (1).

61000005559 is an equidigital number, since it uses as much as digits as its factorization.

61000005559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6750, while the sum is 31.

The spelling of 61000005559 in words is "sixty-one billion, five thousand, five hundred fifty-nine".