661486421551200 has 432 divisors, whose sum is σ = 2652004687492944. Its totient is φ = 142302960844800.

The previous prime is 661486421551159. The next prime is 661486421551201. The reversal of 661486421551200 is 2155124684166.

It is a super-2 number, since 2×661486421551200² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661486421551201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 163438581 + ... + 167436980.

It is an arithmetic number, because the mean of its divisors is an integer number (6138899739567).

Almost surely, 2^{661486421551200} is an apocalyptic number.

661486421551200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661486421551200 is an abundant number, since it is smaller than the sum of its proper divisors (1990518265941744).

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

661486421551200 is a wasteful number, since it uses less digits than its factorization.

661486421551200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330875615 (or 330875595 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 661486421551200 in words is "six hundred sixty-one trillion, four hundred eighty-six billion, four hundred twenty-one million, five hundred fifty-one thousand, two hundred".