661899985203 has 8 divisors (see below), whose sum is σ = 897491505600. Its totient is φ = 433787560808.

The previous prime is 661899985177. The next prime is 661899985231. The reversal of 661899985203 is 302589998166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661899985203 - 2¹⁷ = 661899854131 is a prime.

It is a super-2 number, since 2×661899985203² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (661899905203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1869773793 + ... + 1869774146.

It is an arithmetic number, because the mean of its divisors is an integer number (112186438200).

Almost surely, 2^661899985203 is an apocalyptic number.

661899985203 is a deficient number, since it is larger than the sum of its proper divisors (235591520397).

661899985203 is a wasteful number, since it uses less digits than its factorization.

661899985203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739548001.

The product of its (nonzero) digits is 50388480, while the sum is 66.

The spelling of 661899985203 in words is "six hundred sixty-one billion, eight hundred ninety-nine million, nine hundred eighty-five thousand, two hundred three".