1985714644661 has 16 divisors (see below), whose sum is σ = 2167705507968. Its totient is φ = 1803969446400.

The previous prime is 1985714644621. The next prime is 1985714644733. The reversal of 1985714644661 is 1664464175891.

It is not a de Polignac number, because 1985714644661 - 2¹⁰ = 1985714643637 is a prime.

It is a super-2 number, since 2×1985714644661² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1985714644594 and 1985714644603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985714644621) 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 15 ways as a sum of consecutive naturals, for example, 138650381 + ... + 138664701.

It is an arithmetic number, because the mean of its divisors is an integer number (135481594248).

Almost surely, 2^{1985714644661} is an apocalyptic number.

1985714644661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1985714644661 is a deficient number, since it is larger than the sum of its proper divisors (181990863307).

1985714644661 is a wasteful number, since it uses less digits than its factorization.

1985714644661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22012.

The product of its digits is 34836480, while the sum is 62.

The spelling of 1985714644661 in words is "one trillion, nine hundred eighty-five billion, seven hundred fourteen million, six hundred forty-four thousand, six hundred sixty-one".