61641558 has 48 divisors (see below), whose sum is σ = 154277136. Its totient is φ = 17579520.

The previous prime is 61641553. The next prime is 61641563. The reversal of 61641558 is 85514616.

61641558 is a `hidden beast` number, since 6 + 1 + 641 + 5 + 5 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (61641553) and next prime (61641563).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61641551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5791 + ... + 12522.

It is an arithmetic number, because the mean of its divisors is an integer number (3214107).

Almost surely, 2^61641558 is an apocalyptic number.

61641558 is an abundant number, since it is smaller than the sum of its proper divisors (92635578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61641558 is a wasteful number, since it uses less digits than its factorization.

61641558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18349 (or 18346 counting only the distinct ones).

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

The square root of 61641558 is about 7851.2137915102. The cubic root of 61641558 is about 395.0249580983.

The spelling of 61641558 in words is "sixty-one million, six hundred forty-one thousand, five hundred fifty-eight".