6906909443738 has 4 divisors (see below), whose sum is σ = 10360364165610. Its totient is φ = 3453454721868.

The previous prime is 6906909443737. The next prime is 6906909443761. The reversal of 6906909443738 is 8373449096096.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 6851709350929 + 55200092809 = 2617577^2 + 234947^2 .

It is not an unprimeable number, because it can be changed into a prime (6906909443737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1726727360933 + ... + 1726727360936.

Almost surely, 2^{6906909443738} is an apocalyptic number.

6906909443738 is a deficient number, since it is larger than the sum of its proper divisors (3453454721872).

6906909443738 is a wasteful number, since it uses less digits than its factorization.

6906909443738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3453454721871.

The product of its (nonzero) digits is 211631616, while the sum is 68.

The spelling of 6906909443738 in words is "six trillion, nine hundred six billion, nine hundred nine million, four hundred forty-three thousand, seven hundred thirty-eight".