68225521 has 32 divisors (see below), whose sum is σ = 90091008. Its totient is φ = 50181120.

The previous prime is 68225467. The next prime is 68225537. The reversal of 68225521 is 12552286.

It is a 4-Lehmer number, since φ(68225521) divides (68225521-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 68225521 - 2⁷ = 68225393 is a prime.

It is a deceptive number, since it divides R_68225520.

It is not an unprimeable number, because it can be changed into a prime (68225551) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 77001 + ... + 77881.

It is an arithmetic number, because the mean of its divisors is an integer number (2815344).

Almost surely, 2^68225521 is an apocalyptic number.

It is an amenable number.

68225521 is a deficient number, since it is larger than the sum of its proper divisors (21865487).

68225521 is a wasteful number, since it uses less digits than its factorization.

68225521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961.

The product of its digits is 9600, while the sum is 31.

The square root of 68225521 is about 8259.8741515837. The cubic root of 68225521 is about 408.6162372525.

It can be divided in two parts, 682255 and 21, that added together give a square (682276 = 826²).

The spelling of 68225521 in words is "sixty-eight million, two hundred twenty-five thousand, five hundred twenty-one".