640660120150 has 48 divisors (see below), whose sum is σ = 1203067530000. Its totient is φ = 253813772160.

The previous prime is 640660120099. The next prime is 640660120183. The reversal of 640660120150 is 51021066046.

It is a super-2 number, since 2×640660120150² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 2476849 + ... + 2723251.

It is an arithmetic number, because the mean of its divisors is an integer number (25063906875).

Almost surely, 2^640660120150 is an apocalyptic number.

640660120150 is a deficient number, since it is larger than the sum of its proper divisors (562407409850).

640660120150 is a wasteful number, since it uses less digits than its factorization.

640660120150 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246913 (or 246908 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 640660120150 its reverse (51021066046), we get a palindrome (691681186196).

The spelling of 640660120150 in words is "six hundred forty billion, six hundred sixty million, one hundred twenty thousand, one hundred fifty".