61355553 has 16 divisors (see below), whose sum is σ = 94212096. Its totient is φ = 34791120.

The previous prime is 61355537. The next prime is 61355597. The reversal of 61355553 is 35555316.

It is not a de Polignac number, because 61355553 - 2⁴ = 61355537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61355653) 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, 8401 + ... + 13902.

It is an arithmetic number, because the mean of its divisors is an integer number (5888256).

Almost surely, 2^61355553 is an apocalyptic number.

It is an amenable number.

61355553 is a deficient number, since it is larger than the sum of its proper divisors (32856543).

61355553 is a wasteful number, since it uses less digits than its factorization.

61355553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22444.

The product of its digits is 33750, while the sum is 33.

The square root of 61355553 is about 7832.9785522495. The cubic root of 61355553 is about 394.4130640968.

It can be divided in two parts, 6 and 1355553, that multiplied together give a palindrome (8133318).

The spelling of 61355553 in words is "sixty-one million, three hundred fifty-five thousand, five hundred fifty-three".