8647387501661 has 8 divisors (see below), whose sum is σ = 8780468921280. Its totient is φ = 8515273947328.

The previous prime is 8647387501657. The next prime is 8647387501679. The reversal of 8647387501661 is 1661057837468.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 8647387501661 - 2² = 8647387501657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8647387501594 and 8647387501603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8647387501631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241948316 + ... + 241984053.

It is an arithmetic number, because the mean of its divisors is an integer number (1097558615160).

Almost surely, 2^{8647387501661} is an apocalyptic number.

It is an amenable number.

8647387501661 is a deficient number, since it is larger than the sum of its proper divisors (133081419619).

8647387501661 is a wasteful number, since it uses less digits than its factorization.

8647387501661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483932643.

The product of its (nonzero) digits is 40642560, while the sum is 62.

The spelling of 8647387501661 in words is "eight trillion, six hundred forty-seven billion, three hundred eighty-seven million, five hundred one thousand, six hundred sixty-one".