1646654340426 has 32 divisors (see below), whose sum is σ = 3373830665856. Its totient is φ = 535466016000.

The previous prime is 1646654340403. The next prime is 1646654340479. The reversal of 1646654340426 is 6240434566461.

It is a super-2 number, since 2×1646654340426² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4219246 + ... + 4592966.

It is an arithmetic number, because the mean of its divisors is an integer number (105432208308).

Almost surely, 2^{1646654340426} is an apocalyptic number.

1646654340426 is an abundant number, since it is smaller than the sum of its proper divisors (1727176325430).

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

1646654340426 is a wasteful number, since it uses less digits than its factorization.

1646654340426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391678.

The product of its (nonzero) digits is 9953280, while the sum is 51.

The spelling of 1646654340426 in words is "one trillion, six hundred forty-six billion, six hundred fifty-four million, three hundred forty thousand, four hundred twenty-six".