64536199231 has 4 divisors (see below), whose sum is σ = 73755656272. Its totient is φ = 55316742192.

The previous prime is 64536199229. The next prime is 64536199241. The reversal of 64536199231 is 13299163546.

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

It is a cyclic number.

It is not a de Polignac number, because 64536199231 - 2¹ = 64536199229 is a prime.

It is a super-2 number, since 2×64536199231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64536199241) 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, 4609728510 + ... + 4609728523.

It is an arithmetic number, because the mean of its divisors is an integer number (18438914068).

Almost surely, 2^64536199231 is an apocalyptic number.

64536199231 is a deficient number, since it is larger than the sum of its proper divisors (9219457041).

64536199231 is an equidigital number, since it uses as much as digits as its factorization.

64536199231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9219457040.

The product of its digits is 1049760, while the sum is 49.

The spelling of 64536199231 in words is "sixty-four billion, five hundred thirty-six million, one hundred ninety-nine thousand, two hundred thirty-one".