64640394151 has 4 divisors (see below), whose sum is σ = 65233425400. Its totient is φ = 64047362904.

The previous prime is 64640394127. The next prime is 64640394157. The reversal of 64640394151 is 15149304646.

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 64640394151 - 2²¹ = 64638296999 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64640394098 and 64640394107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64640394157) 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, 296515461 + ... + 296515678.

It is an arithmetic number, because the mean of its divisors is an integer number (16308356350).

Almost surely, 2^64640394151 is an apocalyptic number.

64640394151 is a deficient number, since it is larger than the sum of its proper divisors (593031249).

64640394151 is a wasteful number, since it uses less digits than its factorization.

64640394151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593031248.

The product of its (nonzero) digits is 311040, while the sum is 43.

Adding to 64640394151 its reverse (15149304646), we get a palindrome (79789698797).

The spelling of 64640394151 in words is "sixty-four billion, six hundred forty million, three hundred ninety-four thousand, one hundred fifty-one".