6694378251 has 16 divisors (see below), whose sum is σ = 9738847488. Its totient is φ = 4056544800.

The previous prime is 6694378157. The next prime is 6694378261. The reversal of 6694378251 is 1528734966.

It is not a de Polignac number, because 6694378251 - 2¹⁰ = 6694377227 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6694378194 and 6694378203.

It is not an unprimeable number, because it can be changed into a prime (6694378261) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262266 + ... + 286656.

It is an arithmetic number, because the mean of its divisors is an integer number (608677968).

Almost surely, 2^6694378251 is an apocalyptic number.

6694378251 is a deficient number, since it is larger than the sum of its proper divisors (3044469237).

6694378251 is a wasteful number, since it uses less digits than its factorization.

6694378251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32722.

The product of its digits is 2177280, while the sum is 51.

The square root of 6694378251 is about 81819.1802146660. The cubic root of 6694378251 is about 1884.6762127526.

The spelling of 6694378251 in words is "six billion, six hundred ninety-four million, three hundred seventy-eight thousand, two hundred fifty-one".