106721561830845 has 16 divisors (see below), whose sum is σ = 183889460385792. Its totient is φ = 52539845824320.

The previous prime is 106721561830837. The next prime is 106721561830861. The reversal of 106721561830845 is 548038165127601.

It is a happy number.

It is not a de Polignac number, because 106721561830845 - 2³ = 106721561830837 is a prime.

It is a super-2 number, since 2×106721561830845² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 273645030141 + ... + 273645030530.

It is an arithmetic number, because the mean of its divisors is an integer number (11493091274112).

Almost surely, 2^{106721561830845} is an apocalyptic number.

106721561830845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

106721561830845 is a deficient number, since it is larger than the sum of its proper divisors (77167898554947).

106721561830845 is a wasteful number, since it uses less digits than its factorization.

106721561830845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 547290060692.

The product of its (nonzero) digits is 9676800, while the sum is 57.

The spelling of 106721561830845 in words is "one hundred six trillion, seven hundred twenty-one billion, five hundred sixty-one million, eight hundred thirty thousand, eight hundred forty-five".