61968553 has 8 divisors (see below), whose sum is σ = 65716488. Its totient is φ = 58232064.

The previous prime is 61968551. The next prime is 61968559. The reversal of 61968553 is 35586916.

It can be written as a sum of positive squares in 4 ways, for example, as 40094224 + 21874329 = 6332^2 + 4677^2 .

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 61968553 - 2¹ = 61968551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61968551) 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, 9975 + ... + 14947.

It is an arithmetic number, because the mean of its divisors is an integer number (8214561).

Almost surely, 2^61968553 is an apocalyptic number.

It is an amenable number.

61968553 is a deficient number, since it is larger than the sum of its proper divisors (3747935).

61968553 is a wasteful number, since it uses less digits than its factorization.

61968553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5723.

The product of its digits is 194400, while the sum is 43.

The square root of 61968553 is about 7872.0107342406. The cubic root of 61968553 is about 395.7222336205.

The spelling of 61968553 in words is "sixty-one million, nine hundred sixty-eight thousand, five hundred fifty-three".