6687770402 has 4 divisors (see below), whose sum is σ = 10031655606. Its totient is φ = 3343885200.

The previous prime is 6687770393. The next prime is 6687770407. The reversal of 6687770402 is 2040777866.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2040777866 = 2 ⋅1020388933.

It can be written as a sum of positive squares in only one way, i.e., 3931415401 + 2756355001 = 62701^2 + 52501^2 .

It is not an unprimeable number, because it can be changed into a prime (6687770407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1671942599 + ... + 1671942602.

Almost surely, 2^6687770402 is an apocalyptic number.

6687770402 is a deficient number, since it is larger than the sum of its proper divisors (3343885204).

6687770402 is a wasteful number, since it uses less digits than its factorization.

6687770402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3343885203.

The product of its (nonzero) digits is 790272, while the sum is 47.

The square root of 6687770402 is about 81778.7894383379. The cubic root of 6687770402 is about 1884.0559034339.

The spelling of 6687770402 in words is "six billion, six hundred eighty-seven million, seven hundred seventy thousand, four hundred two".