1640654610212 has 6 divisors (see below), whose sum is σ = 2871145567878. Its totient is φ = 820327305104.

The previous prime is 1640654610149. The next prime is 1640654610233. The reversal of 1640654610212 is 2120164560461.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1516705550116 + 123949060096 = 1231546^2 + 352064^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 205081826273 + ... + 205081826280.

It is an arithmetic number, because the mean of its divisors is an integer number (478524261313).

Almost surely, 2^{1640654610212} is an apocalyptic number.

It is an amenable number.

1640654610212 is a deficient number, since it is larger than the sum of its proper divisors (1230490957666).

1640654610212 is a wasteful number, since it uses less digits than its factorization.

1640654610212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410163652557 (or 410163652555 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 1640654610212 in words is "one trillion, six hundred forty billion, six hundred fifty-four million, six hundred ten thousand, two hundred twelve".