61355646 has 24 divisors (see below), whose sum is σ = 145022904. Its totient is φ = 18592560.

The previous prime is 61355641. The next prime is 61355647. The reversal of 61355646 is 64655316.

61355646 is a `hidden beast` number, since 6 + 1 + 3 + 5 + 5 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 61355646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61355641) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 154741 + ... + 155136.

It is an arithmetic number, because the mean of its divisors is an integer number (6042621).

Almost surely, 2^61355646 is an apocalyptic number.

61355646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

61355646 is an abundant number, since it is smaller than the sum of its proper divisors (83667258).

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

61355646 is a wasteful number, since it uses less digits than its factorization.

61355646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309896 (or 309893 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 61355646 is about 7832.9844886863. The cubic root of 61355646 is about 394.4132633746.

It can be divided in two parts, 61355 and 646, that added together give a square (62001 = 249²).

The spelling of 61355646 in words is "sixty-one million, three hundred fifty-five thousand, six hundred forty-six".