1601155066501 has 4 divisors (see below), whose sum is σ = 1603792884352. Its totient is φ = 1598517248652.

The previous prime is 1601155066481. The next prime is 1601155066531. The reversal of 1601155066501 is 1056605511061.

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 1601155066501 - 2²⁷ = 1601020848773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601155066531) 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, 1318908015 + ... + 1318909228.

It is an arithmetic number, because the mean of its divisors is an integer number (400948221088).

Almost surely, 2^{1601155066501} is an apocalyptic number.

It is an amenable number.

1601155066501 is a deficient number, since it is larger than the sum of its proper divisors (2637817851).

1601155066501 is an equidigital number, since it uses as much as digits as its factorization.

1601155066501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2637817850.

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 1601155066501 in words is "one trillion, six hundred one billion, one hundred fifty-five million, sixty-six thousand, five hundred one".