6667761721432 has 32 divisors (see below), whose sum is σ = 14288253530400. Its totient is φ = 2857573626624.

The previous prime is 6667761721339. The next prime is 6667761721433. The reversal of 6667761721432 is 2341271677666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6667761721433) 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, 3600078 + ... + 5127970.

It is an arithmetic number, because the mean of its divisors is an integer number (446507922825).

Almost surely, 2^{6667761721432} is an apocalyptic number.

It is an amenable number.

6667761721432 is an abundant number, since it is smaller than the sum of its proper divisors (7620491808968).

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

6667761721432 is a wasteful number, since it uses less digits than its factorization.

6667761721432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1605835 (or 1605831 counting only the distinct ones).

The product of its digits is 21337344, while the sum is 58.

The spelling of 6667761721432 in words is "six trillion, six hundred sixty-seven billion, seven hundred sixty-one million, seven hundred twenty-one thousand, four hundred thirty-two".