3997091278079 has 4 divisors (see below), whose sum is σ = 4017801595776. Its totient is φ = 3976380960384.

The previous prime is 3997091278049. The next prime is 3997091278099. The reversal of 3997091278079 is 9708721907993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3997091278079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3997091278009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10355158559 + ... + 10355158944.

It is an arithmetic number, because the mean of its divisors is an integer number (1004450398944).

Almost surely, 2^{3997091278079} is an apocalyptic number.

3997091278079 is a deficient number, since it is larger than the sum of its proper divisors (20710317697).

3997091278079 is a wasteful number, since it uses less digits than its factorization.

3997091278079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20710317696.

The product of its (nonzero) digits is 108020304, while the sum is 71.

The spelling of 3997091278079 in words is "three trillion, nine hundred ninety-seven billion, ninety-one million, two hundred seventy-eight thousand, seventy-nine".