1361640005 has 8 divisors (see below), whose sum is σ = 1782510624. Its totient is φ = 990283600.

The previous prime is 1361639977. The next prime is 1361640029. The reversal of 1361640005 is 5000461631.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1361640005 - 2¹⁸ = 1361377861 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12378491 + ... + 12378600.

It is an arithmetic number, because the mean of its divisors is an integer number (222813828).

Almost surely, 2^1361640005 is an apocalyptic number.

It is an amenable number.

1361640005 is a deficient number, since it is larger than the sum of its proper divisors (420870619).

1361640005 is a wasteful number, since it uses less digits than its factorization.

1361640005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24757107.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 1361640005 is about 36900.4065695759. The cubic root of 1361640005 is about 1108.3768188917.

The spelling of 1361640005 in words is "one billion, three hundred sixty-one million, six hundred forty thousand, five".