61426152649 has 27 divisors (see below), whose sum is σ = 66617975541. Its totient is φ = 56627168640.

The previous prime is 61426152643. The next prime is 61426152659. The reversal of 61426152649 is 94625162416.

The square root of 61426152649 is 247843.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 5667831225 + 55758321424 = 75285^2 + 236132^2 .

It is not a de Polignac number, because 61426152649 - 2⁵ = 61426152617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61426152599 and 61426152608.

It is not an unprimeable number, because it can be changed into a prime (61426152643) 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 in 26 ways as a sum of consecutive naturals, for example, 257013072 + ... + 257013310.

Almost surely, 2^61426152649 is an apocalyptic number.

61426152649 is the 247843-rd square number.

61426152649 is the 123922-nd centered octagonal number.

It is an amenable number.

61426152649 is a deficient number, since it is larger than the sum of its proper divisors (5191822892).

61426152649 is an frugal number, since it uses more digits than its factorization.

61426152649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 317 counting only the distinct ones).

The product of its digits is 622080, while the sum is 46.

The spelling of 61426152649 in words is "sixty-one billion, four hundred twenty-six million, one hundred fifty-two thousand, six hundred forty-nine".