61452187866 has 56 divisors (see below), whose sum is σ = 138257854560. Its totient is φ = 20476111176.

The previous prime is 61452187861. The next prime is 61452187897. The reversal of 61452187866 is 66878125416.

61452187866 is a `hidden beast` number, since 6 + 1 + 452 + 187 + 8 + 6 + 6 = 666.

It is a super-3 number, since 3×61452187866³ (a number of 33 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (61452187861) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 4663395 + ... + 4676553.

It is an arithmetic number, because the mean of its divisors is an integer number (2468890260).

Almost surely, 2^61452187866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61452187866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69128927280).

61452187866 is an abundant number, since it is smaller than the sum of its proper divisors (76805666694).

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

61452187866 is a wasteful number, since it uses less digits than its factorization.

61452187866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16382 (or 16367 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 61452187866 in words is "sixty-one billion, four hundred fifty-two million, one hundred eighty-seven thousand, eight hundred sixty-six".