7981037977 has 4 divisors (see below), whose sum is σ = 8706586896. Its totient is φ = 7255489060.

The previous prime is 7981037971. The next prime is 7981038001. The reversal of 7981037977 is 7797301897.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7981037977 - 2¹⁵ = 7981005209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7981037971) 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, 362774443 + ... + 362774464.

It is an arithmetic number, because the mean of its divisors is an integer number (2176646724).

Almost surely, 2^7981037977 is an apocalyptic number.

It is an amenable number.

7981037977 is a deficient number, since it is larger than the sum of its proper divisors (725548919).

7981037977 is a wasteful number, since it uses less digits than its factorization.

7981037977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725548918.

The product of its (nonzero) digits is 4667544, while the sum is 58.

The square root of 7981037977 is about 89336.6552821405. The cubic root of 7981037977 is about 1998.4185813037.

The spelling of 7981037977 in words is "seven billion, nine hundred eighty-one million, thirty-seven thousand, nine hundred seventy-seven".