1640884477730 has 16 divisors (see below), whose sum is σ = 3055440062520. Its totient is φ = 633720901632.

The previous prime is 1640884477721. The next prime is 1640884477751. The reversal of 1640884477730 is 377744880461.

It can be written as a sum of positive squares in 4 ways, for example, as 1597081755049 + 43802722681 = 1263757^2 + 209291^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1640884477730.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2829110879 + ... + 2829111458.

Almost surely, 2^{1640884477730} is an apocalyptic number.

1640884477730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1640884477730 is a deficient number, since it is larger than the sum of its proper divisors (1414555584790).

1640884477730 is a wasteful number, since it uses less digits than its factorization.

1640884477730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5658222373.

The product of its (nonzero) digits is 25288704, while the sum is 59.

The spelling of 1640884477730 in words is "one trillion, six hundred forty billion, eight hundred eighty-four million, four hundred seventy-seven thousand, seven hundred thirty".