172309616661 has 48 divisors (see below), whose sum is σ = 297098285568. Its totient is φ = 87956668800.

The previous prime is 172309616659. The next prime is 172309616663. The reversal of 172309616661 is 166616903271.

It is an interprime number because it is at equal distance from previous prime (172309616659) and next prime (172309616663).

It is not a de Polignac number, because 172309616661 - 2¹ = 172309616659 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172309616661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172309616663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1395070 + ... + 1513551.

It is an arithmetic number, because the mean of its divisors is an integer number (6189547616).

Almost surely, 2^172309616661 is an apocalyptic number.

It is an amenable number.

172309616661 is a deficient number, since it is larger than the sum of its proper divisors (124788668907).

172309616661 is a wasteful number, since it uses less digits than its factorization.

172309616661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2908682 (or 2908675 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The spelling of 172309616661 in words is "one hundred seventy-two billion, three hundred nine million, six hundred sixteen thousand, six hundred sixty-one".