661354100 has 36 divisors (see below), whose sum is σ = 1565608128. Its totient is φ = 240492000.

The previous prime is 661354079. The next prime is 661354129. The reversal of 661354100 is 1453166.

It is a self number, because there is not a number n which added to its sum of digits gives 661354100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 299516 + ... + 301715.

Almost surely, 2^661354100 is an apocalyptic number.

It is an amenable number.

661354100 is an abundant number, since it is smaller than the sum of its proper divisors (904254028).

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

661354100 is a wasteful number, since it uses less digits than its factorization.

661354100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 601256 (or 601249 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 661354100 is about 25716.8057892111. The cubic root of 661354100 is about 871.2537962285.

The spelling of 661354100 in words is "six hundred sixty-one million, three hundred fifty-four thousand, one hundred".