101561665 has 8 divisors (see below), whose sum is σ = 121939200. Its totient is φ = 81205872.

The previous prime is 101561651. The next prime is 101561687. The reversal of 101561665 is 566165101.

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 101561665 - 2¹⁵ = 101528897 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7762 + ... + 16228.

It is an arithmetic number, because the mean of its divisors is an integer number (15242400).

Almost surely, 2^101561665 is an apocalyptic number.

It is an amenable number.

101561665 is a deficient number, since it is larger than the sum of its proper divisors (20377535).

101561665 is an equidigital number, since it uses as much as digits as its factorization.

101561665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10871.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 101561665 is about 10077.7807576867. The cubic root of 101561665 is about 466.5626159743.

The spelling of 101561665 in words is "one hundred one million, five hundred sixty-one thousand, six hundred sixty-five".