1661282040 has 128 divisors (see below), whose sum is σ = 5450976000. Its totient is φ = 401694720.

The previous prime is 1661282017. The next prime is 1661282053. The reversal of 1661282040 is 402821661.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1661281989 and 1661282007.

It is a congruent number.

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, 591279 + ... + 594081.

It is an arithmetic number, because the mean of its divisors is an integer number (42585750).

Almost surely, 2^1661282040 is an apocalyptic number.

1661282040 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 1661282040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2725488000).

1661282040 is an abundant number, since it is smaller than the sum of its proper divisors (3789693960).

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

1661282040 is a wasteful number, since it uses less digits than its factorization.

1661282040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3277 (or 3273 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 1661282040 is about 40758.8277554691. The cubic root of 1661282040 is about 1184.3528877969.

The spelling of 1661282040 in words is "one billion, six hundred sixty-one million, two hundred eighty-two thousand, forty".