6999777648 has 50 divisors (see below), whose sum is σ = 20259391064. Its totient is φ = 2333258784.

The previous prime is 6999777619. The next prime is 6999777683. The reversal of 6999777648 is 8467779996.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2699236 + ... + 2701827.

Almost surely, 2^6999777648 is an apocalyptic number.

It is an amenable number.

6999777648 is an abundant number, since it is smaller than the sum of its proper divisors (13259613416).

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

6999777648 is a wasteful number, since it uses less digits than its factorization.

6999777648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5401083 (or 5401068 counting only the distinct ones).

The product of its digits is 288054144, while the sum is 72.

The square root of 6999777648 is about 83664.6738354964. The cubic root of 6999777648 is about 1912.9109280782.

The spelling of 6999777648 in words is "six billion, nine hundred ninety-nine million, seven hundred seventy-seven thousand, six hundred forty-eight".