61121788019 has 2 divisors, whose sum is σ = 61121788020. Its totient is φ = 61121788018.

The previous prime is 61121787983. The next prime is 61121788139. The reversal of 61121788019 is 91088712116.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61121788019 - 2¹² = 61121783923 is a prime.

It is a super-2 number, since 2×61121788019² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (61121788319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30560894009 + 30560894010.

It is an arithmetic number, because the mean of its divisors is an integer number (30560894010).

Almost surely, 2^61121788019 is an apocalyptic number.

61121788019 is a deficient number, since it is larger than the sum of its proper divisors (1).

61121788019 is an equidigital number, since it uses as much as digits as its factorization.

61121788019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 44.

The spelling of 61121788019 in words is "sixty-one billion, one hundred twenty-one million, seven hundred eighty-eight thousand, nineteen".