1985754456644 has 18 divisors (see below), whose sum is σ = 4042428715710. Its totient is φ = 851037624192.

The previous prime is 1985754456641. The next prime is 1985754456671. The reversal of 1985754456644 is 4466544575891.

It can be written as a sum of positive squares in only one way, i.e., 1061233746244 + 924520710400 = 1030162^2 + 961520^2 .

It is not an unprimeable number, because it can be changed into a prime (1985754456641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5065699949 + ... + 5065700340.

It is an arithmetic number, because the mean of its divisors is an integer number (224579373095).

Almost surely, 2^{1985754456644} is an apocalyptic number.

1985754456644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1985754456644 is an abundant number, since it is smaller than the sum of its proper divisors (2056674259066).

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

1985754456644 is a wasteful number, since it uses less digits than its factorization.

1985754456644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10131400307 (or 10131400298 counting only the distinct ones).

The product of its digits is 580608000, while the sum is 68.

The spelling of 1985754456644 in words is "one trillion, nine hundred eighty-five billion, seven hundred fifty-four million, four hundred fifty-six thousand, six hundred forty-four".