1645179347988 has 480 divisors, whose sum is σ = 5143685234688. Its totient is φ = 452693836800.

The previous prime is 1645179347921. The next prime is 1645179347989. The reversal of 1645179347988 is 8897439715461.

1645179347988 is a `hidden beast` number, since 1 + 6 + 4 + 5 + 1 + 79 + 3 + 479 + 88 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645179347989) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 719360181 + ... + 719362467.

Almost surely, 2^{1645179347988} is an apocalyptic number.

1645179347988 is a gapful number since it is divisible by the number (18) 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 1645179347988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2571842617344).

1645179347988 is an abundant number, since it is smaller than the sum of its proper divisors (3498505886700).

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

1645179347988 is a wasteful number, since it uses less digits than its factorization.

1645179347988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745 (or 2734 counting only the distinct ones).

The product of its digits is 365783040, while the sum is 72.

The spelling of 1645179347988 in words is "one trillion, six hundred forty-five billion, one hundred seventy-nine million, three hundred forty-seven thousand, nine hundred eighty-eight".