66494155 has 16 divisors (see below), whose sum is σ = 98207424. Its totient is φ = 42088320.

The previous prime is 66494117. The next prime is 66494177. The reversal of 66494155 is 55149466.

It is a happy number.

It is not a de Polignac number, because 66494155 - 2¹⁷ = 66363083 is a prime.

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, 72616 + ... + 73525.

It is an arithmetic number, because the mean of its divisors is an integer number (6137964).

Almost surely, 2^66494155 is an apocalyptic number.

66494155 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66494155 is a deficient number, since it is larger than the sum of its proper divisors (31713269).

66494155 is a wasteful number, since it uses less digits than its factorization.

66494155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146166.

The product of its digits is 129600, while the sum is 40.

The square root of 66494155 is about 8154.3948273308. The cubic root of 66494155 is about 405.1300806560.

The spelling of 66494155 in words is "sixty-six million, four hundred ninety-four thousand, one hundred fifty-five".