6719921811 has 8 divisors (see below), whose sum is σ = 9955439760. Its totient is φ = 4479947856.

The previous prime is 6719921807. The next prime is 6719921827. The reversal of 6719921811 is 1181299176.

It is a happy number.

It is not a de Polignac number, because 6719921811 - 2² = 6719921807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6719921861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124442970 + ... + 124443023.

It is an arithmetic number, because the mean of its divisors is an integer number (1244429970).

Almost surely, 2^6719921811 is an apocalyptic number.

6719921811 is a deficient number, since it is larger than the sum of its proper divisors (3235517949).

6719921811 is a wasteful number, since it uses less digits than its factorization.

6719921811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248886002 (or 248885996 counting only the distinct ones).

The product of its digits is 54432, while the sum is 45.

The square root of 6719921811 is about 81975.1292222220. The cubic root of 6719921811 is about 1887.0702732138.

The spelling of 6719921811 in words is "six billion, seven hundred nineteen million, nine hundred twenty-one thousand, eight hundred eleven".