106605661551 has 4 divisors (see below), whose sum is σ = 142140882072. Its totient is φ = 71070441032.

The previous prime is 106605661543. The next prime is 106605661553. The reversal of 106605661551 is 155166506601.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 106605661551 - 2³ = 106605661543 is a prime.

It is a super-2 number, since 2×106605661551² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (106605661553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17767610256 + ... + 17767610261.

It is an arithmetic number, because the mean of its divisors is an integer number (35535220518).

Almost surely, 2^106605661551 is an apocalyptic number.

106605661551 is a deficient number, since it is larger than the sum of its proper divisors (35535220521).

106605661551 is an equidigital number, since it uses as much as digits as its factorization.

106605661551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35535220520.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 106605661551 in words is "one hundred six billion, six hundred five million, six hundred sixty-one thousand, five hundred fifty-one".