1661387094 has 96 divisors (see below), whose sum is σ = 3895688160. Its totient is φ = 510105600.

The previous prime is 1661387093. The next prime is 1661387099. The reversal of 1661387094 is 4907831661.

It is a happy number.

It is a super-2 number, since 2×1661387094² = 5520414152219529672, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661387093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2023204 + ... + 2024024.

It is an arithmetic number, because the mean of its divisors is an integer number (40580085).

Almost surely, 2^1661387094 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1661387094, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1947844080).

1661387094 is an abundant number, since it is smaller than the sum of its proper divisors (2234301066).

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

1661387094 is a wasteful number, since it uses less digits than its factorization.

1661387094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006 (or 1003 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 1661387094 is about 40760.1164620515. The cubic root of 1661387094 is about 1184.3778521282.

The spelling of 1661387094 in words is "one billion, six hundred sixty-one million, three hundred eighty-seven thousand, ninety-four".