61599899519 has 2 divisors, whose sum is σ = 61599899520. Its totient is φ = 61599899518.

The previous prime is 61599899503. The next prime is 61599899539. The reversal of 61599899519 is 91599899516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61599899519 - 2⁴ = 61599899503 is a prime.

It is a super-2 number, since 2×61599899519² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61599899539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30799949759 + 30799949760.

It is an arithmetic number, because the mean of its divisors is an integer number (30799949760).

Almost surely, 2^61599899519 is an apocalyptic number.

61599899519 is a deficient number, since it is larger than the sum of its proper divisors (1).

61599899519 is an equidigital number, since it uses as much as digits as its factorization.

61599899519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70858800, while the sum is 71.

It can be divided in two parts, 615998 and 99519, that added together give a palindrome (715517).

The spelling of 61599899519 in words is "sixty-one billion, five hundred ninety-nine million, eight hundred ninety-nine thousand, five hundred nineteen".