68145771 has 4 divisors (see below), whose sum is σ = 90861032. Its totient is φ = 45430512.

The previous prime is 68145709. The next prime is 68145773. The reversal of 68145771 is 17754186.

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

It is not a de Polignac number, because 68145771 - 2⁷ = 68145643 is a prime.

It is a super-2 number, since 2×68145771² = 9287692210368882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68145773) 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, 11357626 + ... + 11357631.

It is an arithmetic number, because the mean of its divisors is an integer number (22715258).

Almost surely, 2^68145771 is an apocalyptic number.

68145771 is a deficient number, since it is larger than the sum of its proper divisors (22715261).

68145771 is a wasteful number, since it uses less digits than its factorization.

68145771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22715260.

The product of its digits is 47040, while the sum is 39.

The square root of 68145771 is about 8255.0451846129. The cubic root of 68145771 is about 408.4569622973.

It can be divided in two parts, 681457 and 71, that added together give a triangular number (681528 = T₁₁₆₇).

The spelling of 68145771 in words is "sixty-eight million, one hundred forty-five thousand, seven hundred seventy-one".