64636501973 has 8 divisors (see below), whose sum is σ = 66129333336. Its totient is φ = 63153792000.

The previous prime is 64636501967. The next prime is 64636502003. The reversal of 64636501973 is 37910563646.

It can be written as a sum of positive squares in 4 ways, for example, as 8003449444 + 56633052529 = 89462^2 + 237977^2 .

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 64636501973 - 2²² = 64632307669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64636501073) 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, 2517428 + ... + 2542973.

It is an arithmetic number, because the mean of its divisors is an integer number (8266166667).

Almost surely, 2^64636501973 is an apocalyptic number.

It is an amenable number.

64636501973 is a deficient number, since it is larger than the sum of its proper divisors (1492831363).

64636501973 is a wasteful number, since it uses less digits than its factorization.

64636501973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5060695.

The product of its (nonzero) digits is 2449440, while the sum is 50.

The spelling of 64636501973 in words is "sixty-four billion, six hundred thirty-six million, five hundred one thousand, nine hundred seventy-three".