61683509499866 has 8 divisors (see below), whose sum is σ = 93146239178100. Its totient is φ = 30634763107168.

The previous prime is 61683509499841. The next prime is 61683509499883. The reversal of 61683509499866 is 66899490538616.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 48321670001641 + 13361839498225 = 6951379^2 + 3655385^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103495821011 + ... + 103495821606.

Almost surely, 2^{61683509499866} is an apocalyptic number.

61683509499866 is a deficient number, since it is larger than the sum of its proper divisors (31462729678234).

61683509499866 is a wasteful number, since it uses less digits than its factorization.

61683509499866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206991642768.

The product of its (nonzero) digits is 3627970560, while the sum is 80.

The spelling of 61683509499866 in words is "sixty-one trillion, six hundred eighty-three billion, five hundred nine million, four hundred ninety-nine thousand, eight hundred sixty-six".