6909681906 has 12 divisors (see below), whose sum is σ = 14970977502. Its totient is φ = 2303227296.

The previous prime is 6909681899. The next prime is 6909681913. The reversal of 6909681906 is 6091869096.

It is an interprime number because it is at equal distance from previous prime (6909681899) and next prime (6909681913).

It can be written as a sum of positive squares in only one way, i.e., 6907105881 + 2576025 = 83109^2 + 1605^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 191935591 + ... + 191935626.

Almost surely, 2^6909681906 is an apocalyptic number.

6909681906 is an abundant number, since it is smaller than the sum of its proper divisors (8061295596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6909681906 is a wasteful number, since it uses less digits than its factorization.

6909681906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383871225 (or 383871222 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 6909681906 is about 83124.4964255423. The cubic root of 6909681906 is about 1904.6682903542.

The spelling of 6909681906 in words is "six billion, nine hundred nine million, six hundred eighty-one thousand, nine hundred six".