1641827620685 has 16 divisors (see below), whose sum is σ = 2349547105536. Its totient is φ = 1076875755648.

The previous prime is 1641827620651. The next prime is 1641827620711. The reversal of 1641827620685 is 5860267281461.

It is not a de Polignac number, because 1641827620685 - 2³² = 1637532653389 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1641827620685.

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, 1019767904 + ... + 1019769513.

It is an arithmetic number, because the mean of its divisors is an integer number (146846694096).

Almost surely, 2^{1641827620685} is an apocalyptic number.

It is an amenable number.

1641827620685 is a deficient number, since it is larger than the sum of its proper divisors (707719484851).

1641827620685 is a wasteful number, since it uses less digits than its factorization.

1641827620685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039537452.

The product of its (nonzero) digits is 7741440, while the sum is 56.

The spelling of 1641827620685 in words is "one trillion, six hundred forty-one billion, eight hundred twenty-seven million, six hundred twenty thousand, six hundred eighty-five".