1641985914623 has 4 divisors (see below), whose sum is σ = 1642097348640. Its totient is φ = 1641874480608.

The previous prime is 1641985914617. The next prime is 1641985914659. The reversal of 1641985914623 is 3264195891461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1641985914623 - 2⁴ = 1641985914607 is a prime.

It is a super-2 number, since 2×1641985914623² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641985914823) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55694903 + ... + 55724376.

It is an arithmetic number, because the mean of its divisors is an integer number (410524337160).

Almost surely, 2^{1641985914623} is an apocalyptic number.

1641985914623 is a deficient number, since it is larger than the sum of its proper divisors (111434017).

1641985914623 is a wasteful number, since it uses less digits than its factorization.

1641985914623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111434016.

The product of its digits is 11197440, while the sum is 59.

The spelling of 1641985914623 in words is "one trillion, six hundred forty-one billion, nine hundred eighty-five million, nine hundred fourteen thousand, six hundred twenty-three".