1640579155 has 16 divisors (see below), whose sum is σ = 2052151200. Its totient is φ = 1257518080.

The previous prime is 1640579153. The next prime is 1640579173. The reversal of 1640579155 is 5519750461.

It is not a de Polignac number, because 1640579155 - 2¹ = 1640579153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1640579153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24190 + ... + 62179.

It is an arithmetic number, because the mean of its divisors is an integer number (128259450).

Almost surely, 2^1640579155 is an apocalyptic number.

1640579155 is a deficient number, since it is larger than the sum of its proper divisors (411572045).

1640579155 is a wasteful number, since it uses less digits than its factorization.

1640579155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86534.

The product of its (nonzero) digits is 189000, while the sum is 43.

The square root of 1640579155 is about 40504.0634381293. The cubic root of 1640579155 is about 1179.4125091899.

The spelling of 1640579155 in words is "one billion, six hundred forty million, five hundred seventy-nine thousand, one hundred fifty-five".