68918551 has 8 divisors (see below), whose sum is σ = 75946640. Its totient is φ = 62137152.

The previous prime is 68918543. The next prime is 68918569. The reversal of 68918551 is 15581986.

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

It is a cyclic number.

It is not a de Polignac number, because 68918551 - 2³ = 68918543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 68918498 and 68918507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68918501) 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, 61086 + ... + 62203.

It is an arithmetic number, because the mean of its divisors is an integer number (9493330).

Almost surely, 2^68918551 is an apocalyptic number.

68918551 is a deficient number, since it is larger than the sum of its proper divisors (7028089).

68918551 is a wasteful number, since it uses less digits than its factorization.

68918551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123345.

The product of its digits is 86400, while the sum is 43.

The square root of 68918551 is about 8301.7197615916. The cubic root of 68918551 is about 409.9951437061.

The spelling of 68918551 in words is "sixty-eight million, nine hundred eighteen thousand, five hundred fifty-one".