662506891 has 4 divisors (see below), whose sum is σ = 677914072. Its totient is φ = 647099712.

The previous prime is 662506883. The next prime is 662506931. The reversal of 662506891 is 198605266.

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

It is a cyclic number.

It is not a de Polignac number, because 662506891 - 2³ = 662506883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 15407137 = 662506891 / (6 + 6 + 2 + 5 + 0 + 6 + 8 + 9 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (662506861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7703526 + ... + 7703611.

It is an arithmetic number, because the mean of its divisors is an integer number (169478518).

Almost surely, 2^662506891 is an apocalyptic number.

662506891 is a deficient number, since it is larger than the sum of its proper divisors (15407181).

662506891 is a wasteful number, since it uses less digits than its factorization.

662506891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15407180.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 662506891 is about 25739.2092147370. The cubic root of 662506891 is about 871.7597231506.

The spelling of 662506891 in words is "six hundred sixty-two million, five hundred six thousand, eight hundred ninety-one".