1664418851080 has 128 divisors (see below), whose sum is σ = 4095361658880. Its totient is φ = 606063144960.

The previous prime is 1664418851077. The next prime is 1664418851083. The reversal of 1664418851080 is 801588144661.

It is an interprime number because it is at equal distance from previous prime (1664418851077) and next prime (1664418851083).

It is a super-2 number, since 2×1664418851080² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1664418851083) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40727217 + ... + 40768063.

It is an arithmetic number, because the mean of its divisors is an integer number (31995012960).

Almost surely, 2^{1664418851080} is an apocalyptic number.

1664418851080 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 1664418851080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2047680829440).

1664418851080 is an abundant number, since it is smaller than the sum of its proper divisors (2430942807800).

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

1664418851080 is a wasteful number, since it uses less digits than its factorization.

1664418851080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42839 (or 42835 counting only the distinct ones).

The product of its (nonzero) digits is 1474560, while the sum is 52.

The spelling of 1664418851080 in words is "one trillion, six hundred sixty-four billion, four hundred eighteen million, eight hundred fifty-one thousand, eighty".