61666458 has 32 divisors (see below), whose sum is σ = 142889856. Its totient is φ = 17376768.

The previous prime is 61666453. The next prime is 61666483. The reversal of 61666458 is 85466616.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (61666453) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6991 + ... + 13122.

It is an arithmetic number, because the mean of its divisors is an integer number (4465308).

Almost surely, 2^61666458 is an apocalyptic number.

61666458 is an abundant number, since it is smaller than the sum of its proper divisors (81223398).

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

61666458 is a wasteful number, since it uses less digits than its factorization.

61666458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20198.

The product of its digits is 207360, while the sum is 42.

The square root of 61666458 is about 7852.7993734719. The cubic root of 61666458 is about 395.0781408192.

The spelling of 61666458 in words is "sixty-one million, six hundred sixty-six thousand, four hundred fifty-eight".