4166856195621 has 16 divisors (see below), whose sum is σ = 6453585241728. Its totient is φ = 2342026900800.

The previous prime is 4166856195613. The next prime is 4166856195631. The reversal of 4166856195621 is 1265916586614.

It is a happy number.

It is not a de Polignac number, because 4166856195621 - 2³ = 4166856195613 is a prime.

It is a super-2 number, since 2×4166856195621² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4166856195631) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1626406290 + ... + 1626408851.

It is an arithmetic number, because the mean of its divisors is an integer number (403349077608).

Almost surely, 2^{4166856195621} is an apocalyptic number.

It is an amenable number.

4166856195621 is a deficient number, since it is larger than the sum of its proper divisors (2286729046107).

4166856195621 is a wasteful number, since it uses less digits than its factorization.

4166856195621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3252815212.

The product of its digits is 18662400, while the sum is 60.

The spelling of 4166856195621 in words is "four trillion, one hundred sixty-six billion, eight hundred fifty-six million, one hundred ninety-five thousand, six hundred twenty-one".