61309554019499 has 2 divisors, whose sum is σ = 61309554019500. Its totient is φ = 61309554019498.

The previous prime is 61309554019429. The next prime is 61309554019561. The reversal of 61309554019499 is 99491045590316.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61309554019499 - 2³² = 61305259052203 is a prime.

It is a super-2 number, since 2×61309554019499² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61309554019429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30654777009749 + 30654777009750.

It is an arithmetic number, because the mean of its divisors is an integer number (30654777009750).

Almost surely, 2^{61309554019499} is an apocalyptic number.

61309554019499 is a deficient number, since it is larger than the sum of its proper divisors (1).

61309554019499 is an equidigital number, since it uses as much as digits as its factorization.

61309554019499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47239200, while the sum is 65.

The spelling of 61309554019499 in words is "sixty-one trillion, three hundred nine billion, five hundred fifty-four million, nineteen thousand, four hundred ninety-nine".