1166805421425 has 576 divisors, whose sum is σ = 2659406929920. Its totient is φ = 477066240000.

The previous prime is 1166805421423. The next prime is 1166805421451. The reversal of 1166805421425 is 5241245086611.

1166805421425 is a `hidden beast` number, since 1 + 1 + 6 + 6 + 80 + 542 + 1 + 4 + 25 = 666.

It is not a de Polignac number, because 1166805421425 - 2¹ = 1166805421423 is a prime.

It is a super-2 number, since 2×1166805421425² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (1166805421423) by changing a digit.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 11328207924 + ... + 11328208026.

It is an arithmetic number, because the mean of its divisors is an integer number (4617025920).

Almost surely, 2^{1166805421425} is an apocalyptic number.

1166805421425 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1166805421425 is an abundant number, since it is smaller than the sum of its proper divisors (1492601508495).

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

1166805421425 is a wasteful number, since it uses less digits than its factorization.

1166805421425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374 (or 366 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 45.

The spelling of 1166805421425 in words is "one trillion, one hundred sixty-six billion, eight hundred five million, four hundred twenty-one thousand, four hundred twenty-five".