64645404451 has 8 divisors (see below), whose sum is σ = 65539843200. Its totient is φ = 63754701120.

The previous prime is 64645404449. The next prime is 64645404517. The reversal of 64645404451 is 15440454646.

It is a happy number.

64645404451 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 64645404451 - 2¹ = 64645404449 is a prime.

It is a super-2 number, since 2×64645404451² (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 = 64645404398 and 64645404407.

It is not an unprimeable number, because it can be changed into a prime (64645401451) 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, 898995 + ... + 968236.

It is an arithmetic number, because the mean of its divisors is an integer number (8192480400).

Almost surely, 2^64645404451 is an apocalyptic number.

64645404451 is a deficient number, since it is larger than the sum of its proper divisors (894438749).

64645404451 is a wasteful number, since it uses less digits than its factorization.

64645404451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1867709.

The product of its (nonzero) digits is 921600, while the sum is 43.

The spelling of 64645404451 in words is "sixty-four billion, six hundred forty-five million, four hundred four thousand, four hundred fifty-one".