640767355446 has 16 divisors (see below), whose sum is σ = 1281553705008. Its totient is φ = 213585952800.

The previous prime is 640767355411. The next prime is 640767355493. The reversal of 640767355446 is 644553767046.

It is a happy number.

640767355446 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 332385 + ... + 1179836.

It is an arithmetic number, because the mean of its divisors is an integer number (80097106563).

Almost surely, 2^640767355446 is an apocalyptic number.

640767355446 is an abundant number, since it is smaller than the sum of its proper divisors (640786349562).

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

640767355446 is a wasteful number, since it uses less digits than its factorization.

640767355446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1582847.

The product of its (nonzero) digits is 50803200, while the sum is 57.

The spelling of 640767355446 in words is "six hundred forty billion, seven hundred sixty-seven million, three hundred fifty-five thousand, four hundred forty-six".