544161660021 has 48 divisors (see below), whose sum is σ = 953512380288. Its totient is φ = 291928320000.

The previous prime is 544161659999. The next prime is 544161660079. The reversal of 544161660021 is 120066161445.

544161660021 is a `hidden beast` number, since 5 + 4 + 4 + 16 + 16 + 600 + 21 = 666.

It is not a de Polignac number, because 544161660021 - 2¹³ = 544161651829 is a prime.

It is a super-2 number, since 2×544161660021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (544161660121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 204055 + ... + 1062996.

It is an arithmetic number, because the mean of its divisors is an integer number (19864841256).

Almost surely, 2^544161660021 is an apocalyptic number.

544161660021 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

544161660021 is a deficient number, since it is larger than the sum of its proper divisors (409350720267).

544161660021 is a wasteful number, since it uses less digits than its factorization.

544161660021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1267482 (or 1267479 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 544161660021 in words is "five hundred forty-four billion, one hundred sixty-one million, six hundred sixty thousand, twenty-one".