7697677021 has 4 divisors (see below), whose sum is σ = 7698502492. Its totient is φ = 7696851552.

The previous prime is 7697677019. The next prime is 7697677033. The reversal of 7697677021 is 1207767967.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3392480025 + 4305196996 = 58245^2 + 65614^2 .

It is a cyclic number.

It is not a de Polignac number, because 7697677021 - 2¹ = 7697677019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7697677021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7697677721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398586 + ... + 417451.

It is an arithmetic number, because the mean of its divisors is an integer number (1924625623).

Almost surely, 2^7697677021 is an apocalyptic number.

It is an amenable number.

7697677021 is a deficient number, since it is larger than the sum of its proper divisors (825471).

7697677021 is an equidigital number, since it uses as much as digits as its factorization.

7697677021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825470.

The product of its (nonzero) digits is 1555848, while the sum is 52.

The square root of 7697677021 is about 87736.4064741656. The cubic root of 7697677021 is about 1974.4822246604.

The spelling of 7697677021 in words is "seven billion, six hundred ninety-seven million, six hundred seventy-seven thousand, twenty-one".