66854155 has 4 divisors (see below), whose sum is σ = 80224992. Its totient is φ = 53483320.

The previous prime is 66854143. The next prime is 66854167. The reversal of 66854155 is 55145866.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (66854143) and next prime (66854167).

It is not a de Polignac number, because 66854155 - 2⁹ = 66853643 is a prime.

It is a super-3 number, since 3×66854155³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6685411 + ... + 6685420.

It is an arithmetic number, because the mean of its divisors is an integer number (20056248).

Almost surely, 2^66854155 is an apocalyptic number.

66854155 is a deficient number, since it is larger than the sum of its proper divisors (13370837).

66854155 is a wasteful number, since it uses less digits than its factorization.

66854155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13370836.

The product of its digits is 144000, while the sum is 40.

The square root of 66854155 is about 8176.4390170783. The cubic root of 66854155 is about 405.8598912310.

The spelling of 66854155 in words is "sixty-six million, eight hundred fifty-four thousand, one hundred fifty-five".