1646653627640 has 32 divisors (see below), whose sum is σ = 4234252186080. Its totient is φ = 564566957952.

The previous prime is 1646653627631. The next prime is 1646653627643. The reversal of 1646653627640 is 467263566461.

It is a super-2 number, since 2×1646653627640² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (56).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1646653627643) by changing a digit.

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, 2940452627 + ... + 2940453186.

It is an arithmetic number, because the mean of its divisors is an integer number (132320380815).

Almost surely, 2^{1646653627640} is an apocalyptic number.

1646653627640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1646653627640 is an abundant number, since it is smaller than the sum of its proper divisors (2587598558440).

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

1646653627640 is a wasteful number, since it uses less digits than its factorization.

1646653627640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5880905831 (or 5880905827 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 56.

The spelling of 1646653627640 in words is "one trillion, six hundred forty-six billion, six hundred fifty-three million, six hundred twenty-seven thousand, six hundred forty".