67811523681 has 64 divisors (see below), whose sum is σ = 102030888960. Its totient is φ = 39712757760.

The previous prime is 67811523677. The next prime is 67811523701. The reversal of 67811523681 is 18632511876.

It is not a de Polignac number, because 67811523681 - 2² = 67811523677 is a prime.

It is a super-2 number, since 2×67811523681² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 67811523681.

It is not an unprimeable number, because it can be changed into a prime (67811523881) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 29649720 + ... + 29652006.

It is an arithmetic number, because the mean of its divisors is an integer number (1594232640).

Almost surely, 2^67811523681 is an apocalyptic number.

It is an amenable number.

67811523681 is a deficient number, since it is larger than the sum of its proper divisors (34219365279).

67811523681 is a wasteful number, since it uses less digits than its factorization.

67811523681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2614.

The product of its digits is 483840, while the sum is 48.

The spelling of 67811523681 in words is "sixty-seven billion, eight hundred eleven million, five hundred twenty-three thousand, six hundred eighty-one".