61599899503 has 2 divisors, whose sum is σ = 61599899504. Its totient is φ = 61599899502.

The previous prime is 61599899497. The next prime is 61599899519. The reversal of 61599899503 is 30599899516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61599899503 - 2¹⁷ = 61599768431 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61599899573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30799949751 + 30799949752.

It is an arithmetic number, because the mean of its divisors is an integer number (30799949752).

Almost surely, 2^61599899503 is an apocalyptic number.

61599899503 is a deficient number, since it is larger than the sum of its proper divisors (1).

61599899503 is an equidigital number, since it uses as much as digits as its factorization.

61599899503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23619600, while the sum is 64.

The spelling of 61599899503 in words is "sixty-one billion, five hundred ninety-nine million, eight hundred ninety-nine thousand, five hundred three".