61544458206 has 240 divisors, whose sum is σ = 173911000032. Its totient is φ = 15923381760.

The previous prime is 61544458187. The next prime is 61544458219. The reversal of 61544458206 is 60285444516.

It is a happy number.

61544458206 is a `hidden beast` number, since 61 + 5 + 4 + 4 + 4 + 582 + 0 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 42947266 + ... + 42948698.

Almost surely, 2^61544458206 is an apocalyptic number.

61544458206 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 61544458206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86955500016).

61544458206 is an abundant number, since it is smaller than the sum of its proper divisors (112366541826).

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

61544458206 is a wasteful number, since it uses less digits than its factorization.

61544458206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 1769 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 61544458206 in words is "sixty-one billion, five hundred forty-four million, four hundred fifty-eight thousand, two hundred six".