64203890617 has 4 divisors (see below), whose sum is σ = 65256413476. Its totient is φ = 63151367760.

The previous prime is 64203890573. The next prime is 64203890651. The reversal of 64203890617 is 71609830246.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1535777721 + 62668112896 = 39189^2 + 250336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64203890617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64203897617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 526261338 + ... + 526261459.

It is an arithmetic number, because the mean of its divisors is an integer number (16314103369).

Almost surely, 2^64203890617 is an apocalyptic number.

It is an amenable number.

64203890617 is a deficient number, since it is larger than the sum of its proper divisors (1052522859).

64203890617 is a wasteful number, since it uses less digits than its factorization.

64203890617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052522858.

The product of its (nonzero) digits is 435456, while the sum is 46.

It can be divided in two parts, 642038 and 90617, that added together give a triangular number (732655 = T₁₂₁₀).

The spelling of 64203890617 in words is "sixty-four billion, two hundred three million, eight hundred ninety thousand, six hundred seventeen".