68161251 has 8 divisors (see below), whose sum is σ = 91028224. Its totient is φ = 45367560.

The previous prime is 68161243. The next prime is 68161271. The reversal of 68161251 is 15216186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 68161251 - 2³ = 68161243 is a prime.

It is a super-2 number, since 2×68161251² = 9291912275770002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68161201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16111 + ... + 19896.

It is an arithmetic number, because the mean of its divisors is an integer number (11378528).

Almost surely, 2^68161251 is an apocalyptic number.

68161251 is a deficient number, since it is larger than the sum of its proper divisors (22866973).

68161251 is a wasteful number, since it uses less digits than its factorization.

68161251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36641.

The product of its digits is 2880, while the sum is 30.

The square root of 68161251 is about 8255.9827398075. The cubic root of 68161251 is about 408.4878883302.

The spelling of 68161251 in words is "sixty-eight million, one hundred sixty-one thousand, two hundred fifty-one".