105667158721 has 4 divisors (see below), whose sum is σ = 105699664944. Its totient is φ = 105634652500.

The previous prime is 105667158697. The next prime is 105667158749. The reversal of 105667158721 is 127851766501.

It is a happy number.

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: 127851766501 = 137 ⋅933224573.

It is a cyclic number.

It is not a de Polignac number, because 105667158721 - 2¹⁹ = 105666634433 is a prime.

It is a super-2 number, since 2×105667158721² (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 (105667153721) 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, 16248235 + ... + 16254736.

It is an arithmetic number, because the mean of its divisors is an integer number (26424916236).

Almost surely, 2^105667158721 is an apocalyptic number.

It is an amenable number.

105667158721 is a deficient number, since it is larger than the sum of its proper divisors (32506223).

105667158721 is an equidigital number, since it uses as much as digits as its factorization.

105667158721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32506222.

The product of its (nonzero) digits is 705600, while the sum is 49.

The spelling of 105667158721 in words is "one hundred five billion, six hundred sixty-seven million, one hundred fifty-eight thousand, seven hundred twenty-one".