661196073073 has 16 divisors (see below), whose sum is σ = 719251540992. Its totient is φ = 605986920000.

The previous prime is 661196073019. The next prime is 661196073079. The reversal of 661196073073 is 370370691166.

It is a cyclic number.

It is not a de Polignac number, because 661196073073 - 2⁹ = 661196072561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661196073079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4518798 + ... + 4662823.

It is an arithmetic number, because the mean of its divisors is an integer number (44953221312).

Almost surely, 2^661196073073 is an apocalyptic number.

It is an amenable number.

661196073073 is a deficient number, since it is larger than the sum of its proper divisors (58055467919).

661196073073 is a wasteful number, since it uses less digits than its factorization.

661196073073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9181776.

The product of its (nonzero) digits is 857304, while the sum is 49.

The spelling of 661196073073 in words is "six hundred sixty-one billion, one hundred ninety-six million, seventy-three thousand, seventy-three".