7991378461 has 8 divisors (see below), whose sum is σ = 8722138464. Its totient is φ = 7261330320.

The previous prime is 7991378443. The next prime is 7991378489. The reversal of 7991378461 is 1648731997.

7991378461 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 7991378461 - 2⁷ = 7991378333 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 (7991378761) 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, 154351 + ... + 199516.

It is an arithmetic number, because the mean of its divisors is an integer number (1090267308).

Almost surely, 2^7991378461 is an apocalyptic number.

It is an amenable number.

7991378461 is a deficient number, since it is larger than the sum of its proper divisors (730760003).

7991378461 is a wasteful number, since it uses less digits than its factorization.

7991378461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355931.

The product of its digits is 2286144, while the sum is 55.

The square root of 7991378461 is about 89394.5102397233. The cubic root of 7991378461 is about 1999.2812801685.

The spelling of 7991378461 in words is "seven billion, nine hundred ninety-one million, three hundred seventy-eight thousand, four hundred sixty-one".