1640744548956 has 48 divisors (see below), whose sum is σ = 4292807719200. Its totient is φ = 541897278336.

The previous prime is 1640744548951. The next prime is 1640744548957. The reversal of 1640744548956 is 6598454470461.

1640744548956 is a `hidden beast` number, since 1 + 6 + 40 + 7 + 44 + 548 + 9 + 5 + 6 = 666.

It is a super-3 number, since 3×1640744548956³ (a number of 38 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1640744548893 and 1640744548902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1640744548951) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69676665 + ... + 69700208.

It is an arithmetic number, because the mean of its divisors is an integer number (89433494150).

Almost surely, 2^{1640744548956} is an apocalyptic number.

It is an amenable number.

1640744548956 is an abundant number, since it is smaller than the sum of its proper divisors (2652063170244).

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

1640744548956 is a wasteful number, since it uses less digits than its factorization.

1640744548956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139376995 (or 139376987 counting only the distinct ones).

The product of its (nonzero) digits is 116121600, while the sum is 63.

The spelling of 1640744548956 in words is "one trillion, six hundred forty billion, seven hundred forty-four million, five hundred forty-eight thousand, nine hundred fifty-six".