1605437912201 has 4 divisors (see below), whose sum is σ = 1605487650000. Its totient is φ = 1605388174404.

The previous prime is 1605437912171. The next prime is 1605437912293. The reversal of 1605437912201 is 1022197345061.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1605437912201 - 2³⁰ = 1604364170377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1605437911201) 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, 24820451 + ... + 24885048.

It is an arithmetic number, because the mean of its divisors is an integer number (401371912500).

Almost surely, 2^{1605437912201} is an apocalyptic number.

It is an amenable number.

1605437912201 is a deficient number, since it is larger than the sum of its proper divisors (49737799).

1605437912201 is an equidigital number, since it uses as much as digits as its factorization.

1605437912201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49737798.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 1605437912201 in words is "one trillion, six hundred five billion, four hundred thirty-seven million, nine hundred twelve thousand, two hundred one".