6681400148 has 6 divisors (see below), whose sum is σ = 11692450266. Its totient is φ = 3340700072.

The previous prime is 6681400093. The next prime is 6681400181. The reversal of 6681400148 is 8410041866.

It can be written as a sum of positive squares in only one way, i.e., 3628616644 + 3052783504 = 60238^2 + 55252^2 .

It is a super-2 number, since 2×6681400148² = 89282215875388843808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 835175015 + ... + 835175022.

It is an arithmetic number, because the mean of its divisors is an integer number (1948741711).

Almost surely, 2^6681400148 is an apocalyptic number.

It is an amenable number.

6681400148 is a deficient number, since it is larger than the sum of its proper divisors (5011050118).

6681400148 is a wasteful number, since it uses less digits than its factorization.

6681400148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670350041 (or 1670350039 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 6681400148 is about 81739.8320771458. The cubic root of 6681400148 is about 1883.4575113116.

The spelling of 6681400148 in words is "six billion, six hundred eighty-one million, four hundred thousand, one hundred forty-eight".