1646987926064 has 240 divisors, whose sum is σ = 3706940365632. Its totient is φ = 704335177728.

The previous prime is 1646987926039. The next prime is 1646987926069. The reversal of 1646987926064 is 4606297896461.

It is a junction number, because it is equal to n+sod(n) for n = 1646987925985 and 1646987926003.

It is not an unprimeable number, because it can be changed into a prime (1646987926069) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2216672477 + ... + 2216673219.

Almost surely, 2^{1646987926064} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1646987926064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1853470182816).

1646987926064 is an abundant number, since it is smaller than the sum of its proper divisors (2059952439568).

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

1646987926064 is a wasteful number, since it uses less digits than its factorization.

1646987926064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1412 (or 1387 counting only the distinct ones).

The product of its (nonzero) digits is 188116992, while the sum is 68.

The spelling of 1646987926064 in words is "one trillion, six hundred forty-six billion, nine hundred eighty-seven million, nine hundred twenty-six thousand, sixty-four".