1646632123640 has 64 divisors (see below), whose sum is σ = 4303609997760. Its totient is φ = 555304504320.

The previous prime is 1646632123627. The next prime is 1646632123681. The reversal of 1646632123640 is 463212366461.

It is a super-2 number, since 2×1646632123640² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1646632123591 and 1646632123600.

It is a congruent 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, 48186437 + ... + 48220596.

It is an arithmetic number, because the mean of its divisors is an integer number (67243906215).

Almost surely, 2^{1646632123640} is an apocalyptic number.

1646632123640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646632123640 is an abundant number, since it is smaller than the sum of its proper divisors (2656977874120).

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

1646632123640 is a wasteful number, since it uses less digits than its factorization.

1646632123640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96407112 (or 96407108 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 44.

The spelling of 1646632123640 in words is "one trillion, six hundred forty-six billion, six hundred thirty-two million, one hundred twenty-three thousand, six hundred forty".