64449794251 has 8 divisors (see below), whose sum is σ = 67465847808. Its totient is φ = 61492305000.

The previous prime is 64449794237. The next prime is 64449794257. The reversal of 64449794251 is 15249794446.

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 64449794251 - 2⁵ = 64449794219 is a prime.

It is a super-4 number, since 4×64449794251⁴ (a number of 44 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64449794192 and 64449794201.

It is not an unprimeable number, because it can be changed into a prime (64449794257) 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, 14638825 + ... + 14643226.

It is an arithmetic number, because the mean of its divisors is an integer number (8433230976).

Almost surely, 2^64449794251 is an apocalyptic number.

64449794251 is a deficient number, since it is larger than the sum of its proper divisors (3016053557).

64449794251 is a wasteful number, since it uses less digits than its factorization.

64449794251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29282153.

The product of its digits is 8709120, while the sum is 55.

The spelling of 64449794251 in words is "sixty-four billion, four hundred forty-nine million, seven hundred ninety-four thousand, two hundred fifty-one".