68671511 has 4 divisors (see below), whose sum is σ = 68730552. Its totient is φ = 68612472.

The previous prime is 68671487. The next prime is 68671553. The reversal of 68671511 is 11517686.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68671511 - 2²⁶ = 1562647 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68671591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27740 + ... + 30113.

It is an arithmetic number, because the mean of its divisors is an integer number (17182638).

Almost surely, 2^68671511 is an apocalyptic number.

68671511 is a deficient number, since it is larger than the sum of its proper divisors (59041).

68671511 is a wasteful number, since it uses less digits than its factorization.

68671511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59040.

The product of its digits is 10080, while the sum is 35.

The square root of 68671511 is about 8286.8275594464. The cubic root of 68671511 is about 409.5046784634.

The spelling of 68671511 in words is "sixty-eight million, six hundred seventy-one thousand, five hundred eleven".