3994699262621 has 8 divisors (see below), whose sum is σ = 3997272094200. Its totient is φ = 3992126709760.

The previous prime is 3994699262579. The next prime is 3994699262623. The reversal of 3994699262621 is 1262629964993.

It can be written as a sum of positive squares in 4 ways, for example, as 69268449721 + 3925430812900 = 263189^2 + 1981270^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3994699262621 is a prime.

It is a super-2 number, since 2×3994699262621² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3994699262623) 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, 33849365 + ... + 33967173.

It is an arithmetic number, because the mean of its divisors is an integer number (499659011775).

Almost surely, 2^{3994699262621} is an apocalyptic number.

It is an amenable number.

3994699262621 is a deficient number, since it is larger than the sum of its proper divisors (2572831579).

3994699262621 is a wasteful number, since it uses less digits than its factorization.

3994699262621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139359.

The product of its digits is 136048896, while the sum is 68.

The spelling of 3994699262621 in words is "three trillion, nine hundred ninety-four billion, six hundred ninety-nine million, two hundred sixty-two thousand, six hundred twenty-one".