68249661 has 16 divisors (see below), whose sum is σ = 91990080. Its totient is φ = 45008000.

The previous prime is 68249651. The next prime is 68249663. The reversal of 68249661 is 16694286.

It is a cyclic number.

It is not a de Polignac number, because 68249661 - 2¹⁹ = 67725373 is a prime.

It is a super-2 number, since 2×68249661² = 9316032453229842, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68249663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175255 + ... + 175643.

It is an arithmetic number, because the mean of its divisors is an integer number (5749380).

Almost surely, 2^68249661 is an apocalyptic number.

It is an amenable number.

68249661 is a deficient number, since it is larger than the sum of its proper divisors (23740419).

68249661 is a wasteful number, since it uses less digits than its factorization.

68249661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876.

The product of its digits is 124416, while the sum is 42.

The square root of 68249661 is about 8261.3353036903. The cubic root of 68249661 is about 408.6644246594.

The spelling of 68249661 in words is "sixty-eight million, two hundred forty-nine thousand, six hundred sixty-one".