64821360971 has 4 divisors (see below), whose sum is σ = 66200538912. Its totient is φ = 63442183032.

The previous prime is 64821360949. The next prime is 64821360979. The reversal of 64821360971 is 17906312846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64821360971 - 2⁶ = 64821360907 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 1379177893 = 64821360971 / (6 + 4 + 8 + 2 + 1 + 3 + 6 + 0 + 9 + 7 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64821360979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 689588900 + ... + 689588993.

It is an arithmetic number, because the mean of its divisors is an integer number (16550134728).

Almost surely, 2^64821360971 is an apocalyptic number.

64821360971 is a deficient number, since it is larger than the sum of its proper divisors (1379177941).

64821360971 is a wasteful number, since it uses less digits than its factorization.

64821360971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379177940.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 64821360971 in words is "sixty-four billion, eight hundred twenty-one million, three hundred sixty thousand, nine hundred seventy-one".