6729919961 has 4 divisors (see below), whose sum is σ = 6734375424. Its totient is φ = 6725464500.

The previous prime is 6729919951. The next prime is 6729920009. The reversal of 6729919961 is 1699199276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6729919961 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 6729919961.

It is not an unprimeable number, because it can be changed into a prime (6729919951) 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, 2225465 + ... + 2228486.

It is an arithmetic number, because the mean of its divisors is an integer number (1683593856).

Almost surely, 2^6729919961 is an apocalyptic number.

It is an amenable number.

6729919961 is a deficient number, since it is larger than the sum of its proper divisors (4455463).

6729919961 is a wasteful number, since it uses less digits than its factorization.

6729919961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4455462.

The product of its digits is 3306744, while the sum is 59.

The square root of 6729919961 is about 82036.0893814424. The cubic root of 6729919961 is about 1888.0056939323.

The spelling of 6729919961 in words is "six billion, seven hundred twenty-nine million, nine hundred nineteen thousand, nine hundred sixty-one".