64643261403 has 8 divisors (see below), whose sum is σ = 98504017408. Its totient is φ = 36939006504.

The previous prime is 64643261387. The next prime is 64643261443. The reversal of 64643261403 is 30416234646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64643261403 - 2⁴ = 64643261387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64643261443) 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, 1539125251 + ... + 1539125292.

It is an arithmetic number, because the mean of its divisors is an integer number (12313002176).

Almost surely, 2^64643261403 is an apocalyptic number.

64643261403 is a deficient number, since it is larger than the sum of its proper divisors (33860756005).

64643261403 is a wasteful number, since it uses less digits than its factorization.

64643261403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078250553.

The product of its (nonzero) digits is 248832, while the sum is 39.

The spelling of 64643261403 in words is "sixty-four billion, six hundred forty-three million, two hundred sixty-one thousand, four hundred three".