4393971642081 has 16 divisors (see below), whose sum is σ = 6698045703168. Its totient is φ = 2509914738000.

The previous prime is 4393971642079. The next prime is 4393971642083. The reversal of 4393971642081 is 1802461793934.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (4393971642079) and next prime (4393971642083).

It is not a de Polignac number, because 4393971642081 - 2¹ = 4393971642079 is a prime.

It is a super-2 number, since 2×4393971642081² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4393971642083) 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, 38533395 + ... + 38647256.

It is an arithmetic number, because the mean of its divisors is an integer number (418627856448).

Almost surely, 2^{4393971642081} is an apocalyptic number.

It is an amenable number.

4393971642081 is a deficient number, since it is larger than the sum of its proper divisors (2304074061087).

4393971642081 is a wasteful number, since it uses less digits than its factorization.

4393971642081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77183372.

The product of its (nonzero) digits is 7838208, while the sum is 57.

The spelling of 4393971642081 in words is "four trillion, three hundred ninety-three billion, nine hundred seventy-one million, six hundred forty-two thousand, eighty-one".