64036540405 has 8 divisors (see below), whose sum is σ = 76845269592. Its totient is φ = 51228284928.

The previous prime is 64036540391. The next prime is 64036540417. The reversal of 64036540405 is 50404563046.

It can be written as a sum of positive squares in 4 ways, for example, as 10053270756 + 53983269649 = 100266^2 + 232343^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 64036540405 - 2³⁵ = 29676802037 is a prime.

It is a Duffinian 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, 341029 + ... + 494341.

It is an arithmetic number, because the mean of its divisors is an integer number (9605658699).

Almost surely, 2^64036540405 is an apocalyptic number.

It is an amenable number.

64036540405 is a deficient number, since it is larger than the sum of its proper divisors (12808729187).

64036540405 is a wasteful number, since it uses less digits than its factorization.

64036540405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236855.

The product of its (nonzero) digits is 172800, while the sum is 37.

The spelling of 64036540405 in words is "sixty-four billion, thirty-six million, five hundred forty thousand, four hundred five".