621122674166909 has 8 divisors (see below), whose sum is σ = 631320747465720. Its totient is φ = 610925108428800.

The previous prime is 621122674166899. The next prime is 621122674166921. The reversal of 621122674166909 is 909661476221126.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 173204603561284 + 447918070605625 = 13160722^2 + 21164075^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 621122674166909 - 2⁴ = 621122674166893 is a prime.

It is a super-2 number, since 2×621122674166909² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621122674166009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124422212 + ... + 129317949.

It is an arithmetic number, because the mean of its divisors is an integer number (78915093433215).

Almost surely, 2^{621122674166909} is an apocalyptic number.

It is an amenable number.

621122674166909 is a deficient number, since it is larger than the sum of its proper divisors (10198073298811).

621122674166909 is a wasteful number, since it uses less digits than its factorization.

621122674166909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253780351.

The product of its (nonzero) digits is 23514624, while the sum is 62.

The spelling of 621122674166909 in words is "six hundred twenty-one trillion, one hundred twenty-two billion, six hundred seventy-four million, one hundred sixty-six thousand, nine hundred nine".