1640401166 has 8 divisors (see below), whose sum is σ = 2460819864. Its totient is φ = 820127880.

The previous prime is 1640401151. The next prime is 1640401181. The reversal of 1640401166 is 6611040461.

It is an interprime number because it is at equal distance from previous prime (1640401151) and next prime (1640401181).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1445 + ... + 57296.

It is an arithmetic number, because the mean of its divisors is an integer number (307602483).

Almost surely, 2^1640401166 is an apocalyptic number.

1640401166 is a deficient number, since it is larger than the sum of its proper divisors (820418698).

1640401166 is a wasteful number, since it uses less digits than its factorization.

1640401166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72706.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 1640401166 is about 40501.8662039171. The cubic root of 1640401166 is about 1179.3698555443.

The spelling of 1640401166 in words is "one billion, six hundred forty million, four hundred one thousand, one hundred sixty-six".