105621205667 has 4 divisors (see below), whose sum is σ = 105621984480. Its totient is φ = 105620426856.

The previous prime is 105621205643. The next prime is 105621205721. The reversal of 105621205667 is 766502126501.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-105621205667 is a prime.

It is a super-2 number, since 2×105621205667² (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 (105621205607) 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, 127067 + ... + 476852.

It is an arithmetic number, because the mean of its divisors is an integer number (26405496120).

Almost surely, 2^105621205667 is an apocalyptic number.

105621205667 is a deficient number, since it is larger than the sum of its proper divisors (778813).

105621205667 is an equidigital number, since it uses as much as digits as its factorization.

105621205667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778812.

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 105621205667 in words is "one hundred five billion, six hundred twenty-one million, two hundred five thousand, six hundred sixty-seven".