1661472414720 has 616 divisors, whose sum is σ = 6000951203424. Its totient is φ = 441185107968.

The previous prime is 1661472414691. The next prime is 1661472414799. The reversal of 1661472414720 is 274142741661.

1661472414720 is a `hidden beast` number, since 1 + 6 + 614 + 7 + 2 + 4 + 1 + 4 + 7 + 20 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1033896157 + ... + 1033897763.

Almost surely, 2^{1661472414720} is an apocalyptic number.

1661472414720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661472414720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3000475601712).

1661472414720 is an abundant number, since it is smaller than the sum of its proper divisors (4339478788704).

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

1661472414720 is an equidigital number, since it uses as much as digits as its factorization.

1661472414720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927 (or 1894 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 1661472414720 in words is "one trillion, six hundred sixty-one billion, four hundred seventy-two million, four hundred fourteen thousand, seven hundred twenty".