64966970815 has 8 divisors (see below), whose sum is σ = 81349946208. Its totient is φ = 49713855840.

The previous prime is 64966970773. The next prime is 64966970819. The reversal of 64966970815 is 51807966946.

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

It is not a de Polignac number, because 64966970815 - 2¹³ = 64966962623 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 (64966970819) 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, 282464976 + ... + 282465205.

It is an arithmetic number, because the mean of its divisors is an integer number (10168743276).

Almost surely, 2^64966970815 is an apocalyptic number.

64966970815 is a deficient number, since it is larger than the sum of its proper divisors (16382975393).

64966970815 is a wasteful number, since it uses less digits than its factorization.

64966970815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564930209.

The product of its (nonzero) digits is 19595520, while the sum is 61.

The spelling of 64966970815 in words is "sixty-four billion, nine hundred sixty-six million, nine hundred seventy thousand, eight hundred fifteen".