61666667307 has 32 divisors (see below), whose sum is σ = 104492505600. Its totient is φ = 35209970784.

The previous prime is 61666667299. The next prime is 61666667317. The reversal of 61666667307 is 70376666616.

It is not a de Polignac number, because 61666667307 - 2³ = 61666667299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61666667317) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108373 + ... + 367529.

It is an arithmetic number, because the mean of its divisors is an integer number (3265390800).

Almost surely, 2^61666667307 is an apocalyptic number.

61666667307 is a deficient number, since it is larger than the sum of its proper divisors (42825838293).

61666667307 is a wasteful number, since it uses less digits than its factorization.

61666667307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260432 (or 260426 counting only the distinct ones).

The product of its (nonzero) digits is 6858432, while the sum is 54.

The spelling of 61666667307 in words is "sixty-one billion, six hundred sixty-six million, six hundred sixty-seven thousand, three hundred seven".