101561666273 has 4 divisors (see below), whose sum is σ = 104837849088. Its totient is φ = 98285483460.

The previous prime is 101561666243. The next prime is 101561666309. The reversal of 101561666273 is 372666165101.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 372666165101 = 41 ⋅9089418661.

It is a cyclic number.

It is not a de Polignac number, because 101561666273 - 2²² = 101557471969 is a prime.

It is a super-2 number, since 2×101561666273² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (101561666243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1638091361 + ... + 1638091422.

It is an arithmetic number, because the mean of its divisors is an integer number (26209462272).

Almost surely, 2^101561666273 is an apocalyptic number.

It is an amenable number.

101561666273 is a deficient number, since it is larger than the sum of its proper divisors (3276182815).

101561666273 is an equidigital number, since it uses as much as digits as its factorization.

101561666273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276182814.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 101561666273 in words is "one hundred one billion, five hundred sixty-one million, six hundred sixty-six thousand, two hundred seventy-three".