66655074 has 16 divisors (see below), whose sum is σ = 136410912. Its totient is φ = 21701568.

The previous prime is 66655067. The next prime is 66655091. The reversal of 66655074 is 47055666.

Added to its reverse (47055666) it gives a triangular number (113710740 = T₁₅₀₈₀).

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, 128919 + ... + 129434.

It is an arithmetic number, because the mean of its divisors is an integer number (8525682).

Almost surely, 2^66655074 is an apocalyptic number.

66655074 is an abundant number, since it is smaller than the sum of its proper divisors (69755838).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66655074 is a wasteful number, since it uses less digits than its factorization.

66655074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258401.

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 66655074 is about 8164.2558754610. The cubic root of 66655074 is about 405.4566286957.

Adding to 66655074 its reverse (47055666), we get a triangular number (113710740 = T₁₅₀₈₀).

The spelling of 66655074 in words is "sixty-six million, six hundred fifty-five thousand, seventy-four".