640148477616 has 60 divisors (see below), whose sum is σ = 1792115449800. Its totient is φ = 213312695040.

The previous prime is 640148477567. The next prime is 640148477677. The reversal of 640148477616 is 616774841046.

It is a happy number.

640148477616 is a `hidden beast` number, since 6 + 4 + 0 + 14 + 8 + 4 + 7 + 7 + 616 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289950 + ... + 1168061.

It is an arithmetic number, because the mean of its divisors is an integer number (29868590830).

Almost surely, 2^640148477616 is an apocalyptic number.

It is an amenable number.

640148477616 is an abundant number, since it is smaller than the sum of its proper divisors (1151966972184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

640148477616 is a wasteful number, since it uses less digits than its factorization.

640148477616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1461074 (or 1461065 counting only the distinct ones).

The product of its (nonzero) digits is 5419008, while the sum is 54.

The spelling of 640148477616 in words is "six hundred forty billion, one hundred forty-eight million, four hundred seventy-seven thousand, six hundred sixteen".