6908978997 has 20 divisors (see below), whose sum is σ = 10325092140. Its totient is φ = 4604079744.

The previous prime is 6908978981. The next prime is 6908979019. The reversal of 6908978997 is 7998798096.

It can be written as a sum of positive squares in 2 ways, for example, as 1347697521 + 5561281476 = 36711^2 + 74574^2 .

It is not a de Polignac number, because 6908978997 - 2⁴ = 6908978981 is a prime.

It is a super-6 number, since 6×6908978997⁶ (a number of 60 digits) contains 666666 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6908978917) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 194983 + ... + 227675.

It is an arithmetic number, because the mean of its divisors is an integer number (516254607).

Almost surely, 2^6908978997 is an apocalyptic number.

It is an amenable number.

6908978997 is a deficient number, since it is larger than the sum of its proper divisors (3416113143).

6908978997 is a wasteful number, since it uses less digits than its factorization.

6908978997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35314 (or 35305 counting only the distinct ones).

The product of its (nonzero) digits is 123451776, while the sum is 72.

The square root of 6908978997 is about 83120.2682683351. The cubic root of 6908978997 is about 1904.6037020513.

The spelling of 6908978997 in words is "six billion, nine hundred eight million, nine hundred seventy-eight thousand, nine hundred ninety-seven".