1213407072865 has 24 divisors (see below), whose sum is σ = 1639237660200. Its totient is φ = 857095540224.

The previous prime is 1213407072859. The next prime is 1213407072937. The reversal of 1213407072865 is 5682707043121.

It can be written as a sum of positive squares in 4 ways, for example, as 21458441169 + 1191948631696 = 146487^2 + 1091764^2 .

It is not a de Polignac number, because 1213407072865 - 2⁵ = 1213407072833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17610040 + ... + 17678809.

It is an arithmetic number, because the mean of its divisors is an integer number (68301569175).

Almost surely, 2^{1213407072865} is an apocalyptic number.

It is an amenable number.

1213407072865 is a deficient number, since it is larger than the sum of its proper divisors (425830587335).

1213407072865 is a wasteful number, since it uses less digits than its factorization.

1213407072865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35288913 (or 35288890 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 1213407072865 in words is "one trillion, two hundred thirteen billion, four hundred seven million, seventy-two thousand, eight hundred sixty-five".