660855434 has 4 divisors (see below), whose sum is σ = 991283154. Its totient is φ = 330427716.

The previous prime is 660855431. The next prime is 660855443. The reversal of 660855434 is 434558066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434558066 = 2 ⋅217279033.

It can be written as a sum of positive squares in only one way, i.e., 656640625 + 4214809 = 25625^2 + 2053^2 .

It is a junction number, because it is equal to n+sod(n) for n = 660855391 and 660855400.

It is not an unprimeable number, because it can be changed into a prime (660855431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165213857 + ... + 165213860.

Almost surely, 2^660855434 is an apocalyptic number.

660855434 is a deficient number, since it is larger than the sum of its proper divisors (330427720).

660855434 is a wasteful number, since it uses less digits than its factorization.

660855434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330427719.

The product of its (nonzero) digits is 345600, while the sum is 41.

The square root of 660855434 is about 25707.1086277706. The cubic root of 660855434 is about 871.0347638484.

The spelling of 660855434 in words is "six hundred sixty million, eight hundred fifty-five thousand, four hundred thirty-four".