3947505659776 has 32 divisors (see below), whose sum is σ = 8987624495280. Its totient is φ = 1691788139520.

The previous prime is 3947505659761. The next prime is 3947505659807. The reversal of 3947505659776 is 6779565057493.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 3947505659699 and 3947505659708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2202848245 + ... + 2202850036.

Almost surely, 2^{3947505659776} is an apocalyptic number.

It is an amenable number.

3947505659776 is an abundant number, since it is smaller than the sum of its proper divisors (5040118835504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3947505659776 is an equidigital number, since it uses as much as digits as its factorization.

3947505659776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4405698302 (or 4405698290 counting only the distinct ones).

The product of its (nonzero) digits is 1500282000, while the sum is 73.

The spelling of 3947505659776 in words is "three trillion, nine hundred forty-seven billion, five hundred five million, six hundred fifty-nine thousand, seven hundred seventy-six".