61599553 has 4 divisors (see below), whose sum is σ = 61691220. Its totient is φ = 61507888.

The previous prime is 61599541. The next prime is 61599557. The reversal of 61599553 is 35599516.

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

It can be written as a sum of positive squares in 2 ways, for example, as 55606849 + 5992704 = 7457^2 + 2448^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61599553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61599557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44818 + ... + 46171.

It is an arithmetic number, because the mean of its divisors is an integer number (15422805).

It is a 672-hyperperfect number.

Almost surely, 2^61599553 is an apocalyptic number.

It is an amenable number.

61599553 is a deficient number, since it is larger than the sum of its proper divisors (91667).

61599553 is an equidigital number, since it uses as much as digits as its factorization.

61599553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91666.

The product of its digits is 182250, while the sum is 43.

The square root of 61599553 is about 7848.5382715510. The cubic root of 61599553 is about 394.9352091563.

The spelling of 61599553 in words is "sixty-one million, five hundred ninety-nine thousand, five hundred fifty-three".