6481062721667 has 4 divisors (see below), whose sum is σ = 6481077984240. Its totient is φ = 6481047459096.

The previous prime is 6481062721657. The next prime is 6481062721697. The reversal of 6481062721667 is 7661272601846.

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-6481062721667 is a prime.

It is a super-2 number, since 2×6481062721667² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6481062721657) 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, 6975548 + ... + 7849865.

It is an arithmetic number, because the mean of its divisors is an integer number (1620269496060).

Almost surely, 2^{6481062721667} is an apocalyptic number.

6481062721667 is a deficient number, since it is larger than the sum of its proper divisors (15262573).

6481062721667 is a wasteful number, since it uses less digits than its factorization.

6481062721667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15262572.

The product of its (nonzero) digits is 8128512, while the sum is 56.

The spelling of 6481062721667 in words is "six trillion, four hundred eighty-one billion, sixty-two million, seven hundred twenty-one thousand, six hundred sixty-seven".