661902 has 16 divisors (see below), whose sum is σ = 1337472. Its totient is φ = 218360.

The previous prime is 661897. The next prime is 661909. The reversal of 661902 is 209166.

It is a super-2 number, since 2×661902² = 876228515208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661909) by changing a digit.

661902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127 + ... + 1157.

It is an arithmetic number, because the mean of its divisors is an integer number (83592).

2⁶⁶¹⁹⁰² is an apocalyptic number.

661902 is an abundant number, since it is smaller than the sum of its proper divisors (675570).

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

661902 is a wasteful number, since it uses less digits than its factorization.

661902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1143.

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 661902 is about 813.5735983917. The cubic root of 661902 is about 87.1494327079.

The spelling of 661902 in words is "six hundred sixty-one thousand, nine hundred two".