64450299691 has 8 divisors (see below), whose sum is σ = 64893382064. Its totient is φ = 64007629920.

The previous prime is 64450299673. The next prime is 64450299701. The reversal of 64450299691 is 19699205446.

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 64450299691 - 2⁵ = 64450299659 is a prime.

It is a super-2 number, since 2×64450299691² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64450239691) 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, 213661 + ... + 417793.

It is an arithmetic number, because the mean of its divisors is an integer number (8111672758).

Almost surely, 2^64450299691 is an apocalyptic number.

64450299691 is a deficient number, since it is larger than the sum of its proper divisors (443082373).

64450299691 is a wasteful number, since it uses less digits than its factorization.

64450299691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206301.

The product of its (nonzero) digits is 4199040, while the sum is 55.

The spelling of 64450299691 in words is "sixty-four billion, four hundred fifty million, two hundred ninety-nine thousand, six hundred ninety-one".