68905551 has 16 divisors (see below), whose sum is σ = 107936640. Its totient is φ = 38548320.

The previous prime is 68905531. The next prime is 68905553. The reversal of 68905551 is 15550986.

It is not a de Polignac number, because 68905551 - 2⁷ = 68905423 is a prime.

It is a super-2 number, since 2×68905551² = 9495949917227202, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68905553) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79881 + ... + 80738.

It is an arithmetic number, because the mean of its divisors is an integer number (6746040).

Almost surely, 2^68905551 is an apocalyptic number.

68905551 is a deficient number, since it is larger than the sum of its proper divisors (39031089).

68905551 is a wasteful number, since it uses less digits than its factorization.

68905551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160646.

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 68905551 is about 8300.9367543669. The cubic root of 68905551 is about 409.9693631678.

The spelling of 68905551 in words is "sixty-eight million, nine hundred five thousand, five hundred fifty-one".