105661066577 has 4 divisors (see below), whose sum is σ = 115266618096. Its totient is φ = 96055515060.

The previous prime is 105661066541. The next prime is 105661066661. The reversal of 105661066577 is 775660166501.

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: 775660166501 = 11 ⋅70514560591.

It is a cyclic number.

It is not a de Polignac number, because 105661066577 - 2⁶ = 105661066513 is a prime.

It is a super-2 number, since 2×105661066577² (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 (105661066507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4802775743 + ... + 4802775764.

It is an arithmetic number, because the mean of its divisors is an integer number (28816654524).

Almost surely, 2^105661066577 is an apocalyptic number.

It is an amenable number.

105661066577 is a deficient number, since it is larger than the sum of its proper divisors (9605551519).

105661066577 is an equidigital number, since it uses as much as digits as its factorization.

105661066577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9605551518.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 105661066577 in words is "one hundred five billion, six hundred sixty-one million, sixty-six thousand, five hundred seventy-seven".