1661411520 has 224 divisors, whose sum is σ = 6051133440. Its totient is φ = 428682240.

The previous prime is 1661411491. The next prime is 1661411533. The reversal of 1661411520 is 251141661.

1661411520 is a `hidden beast` number, since 16 + 614 + 1 + 15 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264739 + ... + 270941.

Almost surely, 2^1661411520 is an apocalyptic number.

1661411520 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 1661411520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3025566720).

1661411520 is an abundant number, since it is smaller than the sum of its proper divisors (4389721920).

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

1661411520 is a wasteful number, since it uses less digits than its factorization.

1661411520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6260 (or 6244 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 1661411520 is about 40760.4160920862. The cubic root of 1661411520 is about 1184.3836564090.

The spelling of 1661411520 in words is "one billion, six hundred sixty-one million, four hundred eleven thousand, five hundred twenty".