1665153440541 has 12 divisors (see below), whose sum is σ = 2414162984220. Its totient is φ = 1105975517760.

The previous prime is 1665153440539. The next prime is 1665153440543. The reversal of 1665153440541 is 1450443515661.

1665153440541 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 153 + 440 + 54 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (1665153440539) and next prime (1665153440543).

It can be written as a sum of positive squares in 2 ways, for example, as 547526002500 + 1117627438041 = 739950^2 + 1057179^2 .

It is not a de Polignac number, because 1665153440541 - 2¹ = 1665153440539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665153440543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 343895440 + ... + 343900281.

It is an arithmetic number, because the mean of its divisors is an integer number (201180248685).

Almost surely, 2^{1665153440541} is an apocalyptic number.

It is an amenable number.

1665153440541 is a deficient number, since it is larger than the sum of its proper divisors (749009543679).

1665153440541 is a wasteful number, since it uses less digits than its factorization.

1665153440541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687795996 (or 687795993 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 1665153440541 in words is "one trillion, six hundred sixty-five billion, one hundred fifty-three million, four hundred forty thousand, five hundred forty-one".