1306640402664 has 16 divisors (see below), whose sum is σ = 3266601006720. Its totient is φ = 435546800880.

The previous prime is 1306640402629. The next prime is 1306640402827. The reversal of 1306640402664 is 4662040466031.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27221675032 + ... + 27221675079.

It is an arithmetic number, because the mean of its divisors is an integer number (204162562920).

Almost surely, 2^{1306640402664} is an apocalyptic number.

It is an amenable number.

1306640402664 is an abundant number, since it is smaller than the sum of its proper divisors (1959960604056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1306640402664 is a wasteful number, since it uses less digits than its factorization.

1306640402664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54443350120 (or 54443350116 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 42.

Adding to 1306640402664 its reverse (4662040466031), we get a palindrome (5968680868695).

The spelling of 1306640402664 in words is "one trillion, three hundred six billion, six hundred forty million, four hundred two thousand, six hundred sixty-four".