1640504155 has 8 divisors (see below), whose sum is σ = 1981818000. Its totient is φ = 1303594656.

The previous prime is 1640504119. The next prime is 1640504189. The reversal of 1640504155 is 5514050461.

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

It is a cyclic number.

It is not a de Polignac number, because 1640504155 - 2¹¹ = 1640502107 is a prime.

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, 1100265 + ... + 1101754.

It is an arithmetic number, because the mean of its divisors is an integer number (247727250).

Almost surely, 2^1640504155 is an apocalyptic number.

1640504155 is a deficient number, since it is larger than the sum of its proper divisors (341313845).

1640504155 is a wasteful number, since it uses less digits than its factorization.

1640504155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2202173.

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 1640504155 is about 40503.1375945124. The cubic root of 1640504155 is about 1179.3945364136.

The spelling of 1640504155 in words is "one billion, six hundred forty million, five hundred four thousand, one hundred fifty-five".