61240740649 has 4 divisors (see below), whose sum is σ = 66808080720. Its totient is φ = 55673400580.

The previous prime is 61240740593. The next prime is 61240740707. The reversal of 61240740649 is 94604704216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61240740649 - 2²⁵ = 61207186217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61240746649) 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 3 ways as a sum of consecutive naturals, for example, 2783670019 + ... + 2783670040.

It is an arithmetic number, because the mean of its divisors is an integer number (16702020180).

Almost surely, 2^61240740649 is an apocalyptic number.

It is an amenable number.

61240740649 is a deficient number, since it is larger than the sum of its proper divisors (5567340071).

61240740649 is a wasteful number, since it uses less digits than its factorization.

61240740649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5567340070.

The product of its (nonzero) digits is 290304, while the sum is 43.

The spelling of 61240740649 in words is "sixty-one billion, two hundred forty million, seven hundred forty thousand, six hundred forty-nine".