61238399069 has 2 divisors, whose sum is σ = 61238399070. Its totient is φ = 61238399068.

The previous prime is 61238399021. The next prime is 61238399077. The reversal of 61238399069 is 96099383216.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51150607225 + 10087791844 = 226165^2 + 100438^2 .

It is a cyclic number.

It is not a de Polignac number, because 61238399069 - 2⁸ = 61238398813 is a prime.

It is a super-2 number, since 2×61238399069² (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 (61238399009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30619199534 + 30619199535.

It is an arithmetic number, because the mean of its divisors is an integer number (30619199535).

Almost surely, 2^61238399069 is an apocalyptic number.

It is an amenable number.

61238399069 is a deficient number, since it is larger than the sum of its proper divisors (1).

61238399069 is an equidigital number, since it uses as much as digits as its factorization.

61238399069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3779136, while the sum is 56.

The spelling of 61238399069 in words is "sixty-one billion, two hundred thirty-eight million, three hundred ninety-nine thousand, sixty-nine".