13004001646 has 4 divisors (see below), whose sum is σ = 19506002472. Its totient is φ = 6502000822.

The previous prime is 13004001643. The next prime is 13004001697. The reversal of 13004001646 is 64610040031.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64610040031 = 3121 ⋅20701711.

It is a self number, because there is not a number n which added to its sum of digits gives 13004001646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13004001643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3251000410 + ... + 3251000413.

It is an arithmetic number, because the mean of its divisors is an integer number (4876500618).

Almost surely, 2^13004001646 is an apocalyptic number.

13004001646 is a deficient number, since it is larger than the sum of its proper divisors (6502000826).

13004001646 is an equidigital number, since it uses as much as digits as its factorization.

13004001646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6502000825.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 13004001646 its reverse (64610040031), we get a palindrome (77614041677).

The spelling of 13004001646 in words is "thirteen billion, four million, one thousand, six hundred forty-six".