64132878649 has 4 divisors (see below), whose sum is σ = 73294718464. Its totient is φ = 54971038836.

The previous prime is 64132878587. The next prime is 64132878671. The reversal of 64132878649 is 94687823146.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64132878649 - 2⁹ = 64132878137 is a prime.

It is a super-2 number, since 2×64132878649² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64132878593 and 64132878602.

It is not an unprimeable number, because it can be changed into a prime (64132878049) 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, 4580919897 + ... + 4580919910.

It is an arithmetic number, because the mean of its divisors is an integer number (18323679616).

Almost surely, 2^64132878649 is an apocalyptic number.

It is an amenable number.

64132878649 is a deficient number, since it is larger than the sum of its proper divisors (9161839815).

64132878649 is an equidigital number, since it uses as much as digits as its factorization.

64132878649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9161839814.

The product of its digits is 13934592, while the sum is 58.

The spelling of 64132878649 in words is "sixty-four billion, one hundred thirty-two million, eight hundred seventy-eight thousand, six hundred forty-nine".