64689040479 has 16 divisors (see below), whose sum is σ = 103761870080. Its totient is φ = 35019630720.

The previous prime is 64689040459. The next prime is 64689040529. The reversal of 64689040479 is 97404098646.

It is a de Polignac number, because none of the positive numbers 2^k-64689040479 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64689040459) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81063562 + ... + 81064359.

It is an arithmetic number, because the mean of its divisors is an integer number (6485116880).

Almost surely, 2^64689040479 is an apocalyptic number.

64689040479 is a deficient number, since it is larger than the sum of its proper divisors (39072829601).

64689040479 is a wasteful number, since it uses less digits than its factorization.

64689040479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162127950.

The product of its (nonzero) digits is 10450944, while the sum is 57.

The spelling of 64689040479 in words is "sixty-four billion, six hundred eighty-nine million, forty thousand, four hundred seventy-nine".