6440546155 has 16 divisors (see below), whose sum is σ = 7949021184. Its totient is φ = 5005929600.

The previous prime is 6440546137. The next prime is 6440546173. The reversal of 6440546155 is 5516450446.

It is an interprime number because it is at equal distance from previous prime (6440546137) and next prime (6440546173).

It is not a de Polignac number, because 6440546155 - 2²³ = 6432157547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104854 + ... + 154516.

It is an arithmetic number, because the mean of its divisors is an integer number (496813824).

Almost surely, 2^6440546155 is an apocalyptic number.

6440546155 is a deficient number, since it is larger than the sum of its proper divisors (1508475029).

6440546155 is a wasteful number, since it uses less digits than its factorization.

6440546155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50406.

The product of its (nonzero) digits is 288000, while the sum is 40.

The square root of 6440546155 is about 80253.0133702156. The cubic root of 6440546155 is about 1860.5480863501.

The spelling of 6440546155 in words is "six billion, four hundred forty million, five hundred forty-six thousand, one hundred fifty-five".