661663050442200 has 72 divisors (see below), whose sum is σ = 2222085077741100. Its totient is φ = 176443480117440.

The previous prime is 661663050442187. The next prime is 661663050442213. The reversal of 661663050442200 is 2244050366166.

It is a happy number.

661663050442200 is a `hidden beast` number, since 6 + 6 + 1 + 6 + 630 + 5 + 0 + 4 + 4 + 2 + 2 + 0 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (661663050442187) and next prime (661663050442213).

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 183795289990 + ... + 183795293589.

Almost surely, 2^{661663050442200} is an apocalyptic number.

661663050442200 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

661663050442200 is an abundant number, since it is smaller than the sum of its proper divisors (1560422027298900).

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

661663050442200 is a wasteful number, since it uses less digits than its factorization.

661663050442200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367590583601 (or 367590583589 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 45.

The spelling of 661663050442200 in words is "six hundred sixty-one trillion, six hundred sixty-three billion, fifty million, four hundred forty-two thousand, two hundred".