2045665401 has 24 divisors (see below), whose sum is σ = 2959680960. Its totient is φ = 1256239296.

The previous prime is 2045665397. The next prime is 2045665409. The reversal of 2045665401 is 1045665402.

It is not a de Polignac number, because 2045665401 - 2² = 2045665397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2045665409) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 254100 + ... + 262026.

It is an arithmetic number, because the mean of its divisors is an integer number (123320040).

Almost surely, 2^2045665401 is an apocalyptic number.

It is an amenable number.

2045665401 is a deficient number, since it is larger than the sum of its proper divisors (914015559).

2045665401 is a wasteful number, since it uses less digits than its factorization.

2045665401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8465 (or 8452 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 2045665401 is about 45229.0327223566. The cubic root of 2045665401 is about 1269.4381131908.

Subtracting from 2045665401 its reverse (1045665402), we obtain a palindrome (999999999).

The spelling of 2045665401 in words is "two billion, forty-five million, six hundred sixty-five thousand, four hundred one".