68521955 has 4 divisors (see below), whose sum is σ = 82226352. Its totient is φ = 54817560.

The previous prime is 68521939. The next prime is 68521963. The reversal of 68521955 is 55912586.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 68521955 - 2⁴ = 68521939 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6852191 + ... + 6852200.

It is an arithmetic number, because the mean of its divisors is an integer number (20556588).

Almost surely, 2^68521955 is an apocalyptic number.

68521955 is a deficient number, since it is larger than the sum of its proper divisors (13704397).

68521955 is a wasteful number, since it uses less digits than its factorization.

68521955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13704396.

The product of its digits is 108000, while the sum is 41.

The square root of 68521955 is about 8277.7989224189. The cubic root of 68521955 is about 409.2071829684.

The spelling of 68521955 in words is "sixty-eight million, five hundred twenty-one thousand, nine hundred fifty-five".