61558641 has 6 divisors (see below), whose sum is σ = 88918050. Its totient is φ = 41039088.

The previous prime is 61558597. The next prime is 61558657. The reversal of 61558641 is 14685516.

61558641 is a `hidden beast` number, since 6 + 1 + 5 + 5 + 8 + 641 = 666.

It can be written as a sum of positive squares in only one way, i.e., 61074225 + 484416 = 7815^2 + 696^2 .

It is not a de Polignac number, because 61558641 - 2⁹ = 61558129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61558596 and 61558605.

It is not an unprimeable number, because it can be changed into a prime (61558661) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3419916 + ... + 3419933.

It is an arithmetic number, because the mean of its divisors is an integer number (14819675).

Almost surely, 2^61558641 is an apocalyptic number.

It is an amenable number.

61558641 is a deficient number, since it is larger than the sum of its proper divisors (27359409).

61558641 is a wasteful number, since it uses less digits than its factorization.

61558641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6839855 (or 6839852 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 61558641 is about 7845.9314934557. The cubic root of 61558641 is about 394.8477563156.

The spelling of 61558641 in words is "sixty-one million, five hundred fifty-eight thousand, six hundred forty-one".