640151235385 has 8 divisors (see below), whose sum is σ = 768514186440. Its totient is φ = 511899185664.

The previous prime is 640151235337. The next prime is 640151235403. The reversal of 640151235385 is 583532151046.

It can be written as a sum of positive squares in 4 ways, for example, as 178475831296 + 461675404089 = 422464^2 + 679467^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640151235385 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27712632 + ... + 27735721.

It is an arithmetic number, because the mean of its divisors is an integer number (96064273305).

Almost surely, 2^640151235385 is an apocalyptic number.

It is an amenable number.

640151235385 is a deficient number, since it is larger than the sum of its proper divisors (128362951055).

640151235385 is a wasteful number, since it uses less digits than its factorization.

640151235385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55450667.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 640151235385 in words is "six hundred forty billion, one hundred fifty-one million, two hundred thirty-five thousand, three hundred eighty-five".