640154756012 has 6 divisors (see below), whose sum is σ = 1120270823028. Its totient is φ = 320077378004.

The previous prime is 640154756011. The next prime is 640154756107. The reversal of 640154756012 is 210657451046.

It is a super-2 number, since 2×640154756012² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640154756011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80019344498 + ... + 80019344505.

It is an arithmetic number, because the mean of its divisors is an integer number (186711803838).

Almost surely, 2^640154756012 is an apocalyptic number.

It is an amenable number.

640154756012 is a deficient number, since it is larger than the sum of its proper divisors (480116067016).

640154756012 is a wasteful number, since it uses less digits than its factorization.

640154756012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160038689007 (or 160038689005 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 640154756012 in words is "six hundred forty billion, one hundred fifty-four million, seven hundred fifty-six thousand, twelve".