61667251049 has 2 divisors, whose sum is σ = 61667251050. Its totient is φ = 61667251048.

The previous prime is 61667251039. The next prime is 61667251081. The reversal of 61667251049 is 94015276616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61123661824 + 543589225 = 247232^2 + 23315^2 .

It is a cyclic number.

It is not a de Polignac number, because 61667251049 - 2⁴ = 61667251033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61667250994 and 61667251012.

It is not a weakly prime, because it can be changed into another prime (61667251039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30833625524 + 30833625525.

It is an arithmetic number, because the mean of its divisors is an integer number (30833625525).

Almost surely, 2^61667251049 is an apocalyptic number.

It is an amenable number.

61667251049 is a deficient number, since it is larger than the sum of its proper divisors (1).

61667251049 is an equidigital number, since it uses as much as digits as its factorization.

61667251049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 61667251049 in words is "sixty-one billion, six hundred sixty-seven million, two hundred fifty-one thousand, forty-nine".