1641009512940 has 576 divisors, whose sum is σ = 5692104327168. Its totient is φ = 351654912000.

The previous prime is 1641009512929. The next prime is 1641009512963. The reversal of 1641009512940 is 492159001461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1641009512892 and 1641009512901.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 432639684 + ... + 432643476.

It is an arithmetic number, because the mean of its divisors is an integer number (9882125568).

Almost surely, 2^{1641009512940} is an apocalyptic number.

1641009512940 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 1641009512940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2846052163584).

1641009512940 is an abundant number, since it is smaller than the sum of its proper divisors (4051094814228).

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

1641009512940 is a wasteful number, since it uses less digits than its factorization.

1641009512940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3998 (or 3989 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 1641009512940 in words is "one trillion, six hundred forty-one billion, nine million, five hundred twelve thousand, nine hundred forty".