1644952607040 has 56 divisors (see below), whose sum is σ = 5222724530400. Its totient is φ = 438654028288.

The previous prime is 1644952607029. The next prime is 1644952607069. The reversal of 1644952607040 is 407062594461.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 856745190 + ... + 856747109.

Almost surely, 2^{1644952607040} is an apocalyptic number.

1644952607040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1644952607040 is an abundant number, since it is smaller than the sum of its proper divisors (3577771923360).

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

1644952607040 is a wasteful number, since it uses less digits than its factorization.

1644952607040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713492319 (or 1713492309 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 48.

The spelling of 1644952607040 in words is "one trillion, six hundred forty-four billion, nine hundred fifty-two million, six hundred seven thousand, forty".