6511205993 has 8 divisors (see below), whose sum is σ = 6821564160. Its totient is φ = 6207117840.

The previous prime is 6511205983. The next prime is 6511206001. The reversal of 6511205993 is 3995021156.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6511205993 - 2⁶ = 6511205929 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6511205993.

It is not an unprimeable number, because it can be changed into a prime (6511205903) 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, 1565378 + ... + 1569531.

It is an arithmetic number, because the mean of its divisors is an integer number (852695520).

Almost surely, 2^6511205993 is an apocalyptic number.

It is an amenable number.

6511205993 is a deficient number, since it is larger than the sum of its proper divisors (310358167).

6511205993 is a wasteful number, since it uses less digits than its factorization.

6511205993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3135007.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 6511205993 is about 80692.0441741316. The cubic root of 6511205993 is about 1867.3274368859.

The spelling of 6511205993 in words is "six billion, five hundred eleven million, two hundred five thousand, nine hundred ninety-three".