64394051437 has 4 divisors (see below), whose sum is σ = 64459962396. Its totient is φ = 64328140480.

The previous prime is 64394051431. The next prime is 64394051507. The reversal of 64394051437 is 73415049346.

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 43896116196 + 20497935241 = 209514^2 + 143171^2 .

It is a cyclic number.

It is not a de Polignac number, because 64394051437 - 2³ = 64394051429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64394051431) 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, 32954014 + ... + 32955967.

It is an arithmetic number, because the mean of its divisors is an integer number (16114990599).

Almost surely, 2^64394051437 is an apocalyptic number.

It is an amenable number.

64394051437 is a deficient number, since it is larger than the sum of its proper divisors (65910959).

64394051437 is an equidigital number, since it uses as much as digits as its factorization.

64394051437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65910958.

The product of its (nonzero) digits is 1088640, while the sum is 46.

The spelling of 64394051437 in words is "sixty-four billion, three hundred ninety-four million, fifty-one thousand, four hundred thirty-seven".