61028272649 has 2 divisors, whose sum is σ = 61028272650. Its totient is φ = 61028272648.

The previous prime is 61028272567. The next prime is 61028272673. The reversal of 61028272649 is 94627282016.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58036182649 + 2992090000 = 240907^2 + 54700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61028272649 is a prime.

It is not a weakly prime, because it can be changed into another prime (61028272549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30514136324 + 30514136325.

It is an arithmetic number, because the mean of its divisors is an integer number (30514136325).

Almost surely, 2^61028272649 is an apocalyptic number.

It is an amenable number.

61028272649 is a deficient number, since it is larger than the sum of its proper divisors (1).

61028272649 is an equidigital number, since it uses as much as digits as its factorization.

61028272649 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 47.

The spelling of 61028272649 in words is "sixty-one billion, twenty-eight million, two hundred seventy-two thousand, six hundred forty-nine".