61601510616649 has 4 divisors (see below), whose sum is σ = 61601766278164. Its totient is φ = 61601254955136.

The previous prime is 61601510616593. The next prime is 61601510616671. The reversal of 61601510616649 is 94661601510616.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7689307161600 + 53912203455049 = 2772960^2 + 7342493^2 .

It is a cyclic number.

It is not a de Polignac number, because 61601510616649 - 2⁹ = 61601510616137 is a prime.

It is a super-2 number, since 2×61601510616649² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61601510616596 and 61601510616605.

It is not an unprimeable number, because it can be changed into a prime (61601510616749) 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 in 3 ways as a sum of consecutive naturals, for example, 127468992 + ... + 127951345.

It is an arithmetic number, because the mean of its divisors is an integer number (15400441569541).

Almost surely, 2^{61601510616649} is an apocalyptic number.

It is an amenable number.

61601510616649 is a deficient number, since it is larger than the sum of its proper divisors (255661515).

61601510616649 is a wasteful number, since it uses less digits than its factorization.

61601510616649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255661514.

The product of its (nonzero) digits is 1399680, while the sum is 52.

The spelling of 61601510616649 in words is "sixty-one trillion, six hundred one billion, five hundred ten million, six hundred sixteen thousand, six hundred forty-nine".