64382757949 has 8 divisors (see below), whose sum is σ = 65033449272. Its totient is φ = 63732326400.

The previous prime is 64382757941. The next prime is 64382757983. The reversal of 64382757949 is 94975728346.

It can be written as a sum of positive squares in 4 ways, for example, as 27516837924 + 36865920025 = 165882^2 + 192005^2 .

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 64382757949 - 2³ = 64382757941 is a prime.

It is a super-2 number, since 2×64382757949² (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 (64382757941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454077 + ... + 578749.

It is an arithmetic number, because the mean of its divisors is an integer number (8129181159).

Almost surely, 2^64382757949 is an apocalyptic number.

It is an amenable number.

64382757949 is a deficient number, since it is larger than the sum of its proper divisors (650691323).

64382757949 is a wasteful number, since it uses less digits than its factorization.

64382757949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129887.

The product of its digits is 91445760, while the sum is 64.

The spelling of 64382757949 in words is "sixty-four billion, three hundred eighty-two million, seven hundred fifty-seven thousand, nine hundred forty-nine".