67721012776 has 24 divisors (see below), whose sum is σ = 127953846810. Its totient is φ = 33601961120.

The previous prime is 67721012771. The next prime is 67721012819.

67721012776 is nontrivially palindromic in base 10.

67721012776 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 62605044100 + 5115968676 = 250210^2 + 71526^2 .

It is a super-2 number, since 2×67721012776² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (67721012771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109351 + ... + 383926.

Almost surely, 2^67721012776 is an apocalyptic number.

It is an amenable number.

67721012776 is a deficient number, since it is larger than the sum of its proper divisors (60232834034).

67721012776 is a wasteful number, since it uses less digits than its factorization.

67721012776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493545 (or 493410 counting only the distinct ones).

The product of its (nonzero) digits is 345744, while the sum is 46.

It can be divided in two parts, 677210 and 12776, that added together give a palindrome (689986).

The spelling of 67721012776 in words is "sixty-seven billion, seven hundred twenty-one million, twelve thousand, seven hundred seventy-six".