6921394577 has 4 divisors (see below), whose sum is σ = 7222324800. Its totient is φ = 6620464356.

The previous prime is 6921394549. The next prime is 6921394609. The reversal of 6921394577 is 7754931296.

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 6921394577 - 2⁸ = 6921394321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6921394547) 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, 150465077 + ... + 150465122.

It is an arithmetic number, because the mean of its divisors is an integer number (1805581200).

Almost surely, 2^6921394577 is an apocalyptic number.

It is an amenable number.

6921394577 is a deficient number, since it is larger than the sum of its proper divisors (300930223).

6921394577 is a wasteful number, since it uses less digits than its factorization.

6921394577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300930222.

The product of its digits is 2857680, while the sum is 53.

The square root of 6921394577 is about 83194.9191777959. The cubic root of 6921394577 is about 1905.7438902610.

The spelling of 6921394577 in words is "six billion, nine hundred twenty-one million, three hundred ninety-four thousand, five hundred seventy-seven".