1641537537664 has 16 divisors (see below), whose sum is σ = 3270250563570. Its totient is φ = 820768768768.

The previous prime is 1641537537637. The next prime is 1641537537677. The reversal of 1641537537664 is 4667357351461.

It can be written as a sum of positive squares in only one way, i.e., 998320705600 + 643216832064 = 999160^2 + 802008^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a junction number, because it is equal to n+sod(n) for n = 1641537537599 and 1641537537608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6412255879 + ... + 6412256134.

Almost surely, 2^{1641537537664} is an apocalyptic number.

It is an amenable number.

1641537537664 is a deficient number, since it is larger than the sum of its proper divisors (1628713025906).

1641537537664 is an equidigital number, since it uses as much as digits as its factorization.

1641537537664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12824512027 (or 12824512015 counting only the distinct ones).

The product of its digits is 38102400, while the sum is 58.

The spelling of 1641537537664 in words is "one trillion, six hundred forty-one billion, five hundred thirty-seven million, five hundred thirty-seven thousand, six hundred sixty-four".