6894779156 has 6 divisors (see below), whose sum is σ = 12065863530. Its totient is φ = 3447389576.

The previous prime is 6894779153. The next prime is 6894779159. The reversal of 6894779156 is 6519774986.

It is an interprime number because it is at equal distance from previous prime (6894779153) and next prime (6894779159).

It can be written as a sum of positive squares in only one way, i.e., 6369636100 + 525143056 = 79810^2 + 22916^2 .

It is a super-2 number, since 2×6894779156² = 95075959220024144672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6894779153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861847391 + ... + 861847398.

It is an arithmetic number, because the mean of its divisors is an integer number (2010977255).

Almost surely, 2^6894779156 is an apocalyptic number.

It is an amenable number.

6894779156 is a deficient number, since it is larger than the sum of its proper divisors (5171084374).

6894779156 is a wasteful number, since it uses less digits than its factorization.

6894779156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1723694793 (or 1723694791 counting only the distinct ones).

The product of its digits is 22861440, while the sum is 62.

The square root of 6894779156 is about 83034.8068944584. The cubic root of 6894779156 is about 1903.2979799722.

The spelling of 6894779156 in words is "six billion, eight hundred ninety-four million, seven hundred seventy-nine thousand, one hundred fifty-six".