6551969651 has 4 divisors (see below), whose sum is σ = 6564842400. Its totient is φ = 6539096904.

The previous prime is 6551969639. The next prime is 6551969659. The reversal of 6551969651 is 1569691556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6551969651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6551969593 and 6551969602.

It is not an unprimeable number, because it can be changed into a prime (6551969659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6435611 + ... + 6436628.

It is an arithmetic number, because the mean of its divisors is an integer number (1641210600).

Almost surely, 2^6551969651 is an apocalyptic number.

6551969651 is a deficient number, since it is larger than the sum of its proper divisors (12872749).

6551969651 is a wasteful number, since it uses less digits than its factorization.

6551969651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12872748.

The product of its digits is 2187000, while the sum is 53.

The square root of 6551969651 is about 80944.2379110459. The cubic root of 6551969651 is about 1871.2161582908.

The spelling of 6551969651 in words is "six billion, five hundred fifty-one million, nine hundred sixty-nine thousand, six hundred fifty-one".