660253406 has 4 divisors (see below), whose sum is σ = 990380112. Its totient is φ = 330126702.

The previous prime is 660253397. The next prime is 660253417. The reversal of 660253406 is 604352066.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 604352066 = 2 ⋅302176033.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165063350 + ... + 165063353.

It is an arithmetic number, because the mean of its divisors is an integer number (247595028).

Almost surely, 2^660253406 is an apocalyptic number.

660253406 is a deficient number, since it is larger than the sum of its proper divisors (330126706).

660253406 is a wasteful number, since it uses less digits than its factorization.

660253406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330126705.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 660253406 is about 25695.3965916076. The cubic root of 660253406 is about 870.7701842311.

The spelling of 660253406 in words is "six hundred sixty million, two hundred fifty-three thousand, four hundred six".