640166161254 has 16 divisors (see below), whose sum is σ = 1314935899248. Its totient is φ = 207621457632.

The previous prime is 640166161253. The next prime is 640166161267. The reversal of 640166161254 is 452161661046.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640166161253) 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, 1441815457 + ... + 1441815900.

It is an arithmetic number, because the mean of its divisors is an integer number (82183493703).

Almost surely, 2^640166161254 is an apocalyptic number.

640166161254 is an abundant number, since it is smaller than the sum of its proper divisors (674769737994).

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

640166161254 is a wasteful number, since it uses less digits than its factorization.

640166161254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2883631399.

The product of its (nonzero) digits is 207360, while the sum is 42.

The spelling of 640166161254 in words is "six hundred forty billion, one hundred sixty-six million, one hundred sixty-one thousand, two hundred fifty-four".