640605851177 has 8 divisors (see below), whose sum is σ = 646543257120. Its totient is φ = 634673152960.

The previous prime is 640605851167. The next prime is 640605851203. The reversal of 640605851177 is 771158506046.

It is a happy number.

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 640605851177 - 2¹² = 640605847081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640605851167) 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, 903227 + ... + 1448112.

It is an arithmetic number, because the mean of its divisors is an integer number (80817907140).

Almost surely, 2^640605851177 is an apocalyptic number.

It is an amenable number.

640605851177 is a deficient number, since it is larger than the sum of its proper divisors (5937405943).

640605851177 is a wasteful number, since it uses less digits than its factorization.

640605851177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353863.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 640605851177 in words is "six hundred forty billion, six hundred five million, eight hundred fifty-one thousand, one hundred seventy-seven".