61250665961 has 4 divisors (see below), whose sum is σ = 61697751252. Its totient is φ = 60803580672.

The previous prime is 61250665951. The next prime is 61250665963. The reversal of 61250665961 is 16956605216.

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 34024015936 + 27226650025 = 184456^2 + 165005^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61250665961 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61250665963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223542440 + ... + 223542713.

It is an arithmetic number, because the mean of its divisors is an integer number (15424437813).

Almost surely, 2^61250665961 is an apocalyptic number.

It is an amenable number.

61250665961 is a deficient number, since it is larger than the sum of its proper divisors (447085291).

61250665961 is a wasteful number, since it uses less digits than its factorization.

61250665961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447085290.

The product of its (nonzero) digits is 583200, while the sum is 47.

The spelling of 61250665961 in words is "sixty-one billion, two hundred fifty million, six hundred sixty-five thousand, nine hundred sixty-one".