68414156721 has 9 divisors (see below), whose sum is σ = 98821582041. Its totient is φ = 45608914692.

The previous prime is 68414156593. The next prime is 68414156749. The reversal of 68414156721 is 12765141486.

The square root of 68414156721 is 261561.

It is a perfect power (a square), and thus also a powerful number.

68414156721 is a `hidden beast` number, since 6 + 8 + 41 + 41 + 567 + 2 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 68414156721 - 2⁷ = 68414156593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68414156221) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 741090 + ... + 828276.

Almost surely, 2^68414156721 is an apocalyptic number.

68414156721 is the 261561-st square number.

68414156721 is the 130781-st centered octagonal number.

It is an amenable number.

68414156721 is a deficient number, since it is larger than the sum of its proper divisors (30407425320).

68414156721 is an frugal number, since it uses more digits than its factorization.

68414156721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174380 (or 87190 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The spelling of 68414156721 in words is "sixty-eight billion, four hundred fourteen million, one hundred fifty-six thousand, seven hundred twenty-one".