661082885099 has 48 divisors (see below), whose sum is σ = 845508132000. Its totient is φ = 512144156160.

The previous prime is 661082885039. The next prime is 661082885107. The reversal of 661082885099 is 990588280166.

It is not a de Polignac number, because 661082885099 - 2²⁸ = 660814449643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661082885039) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16827119 + ... + 16866359.

It is an arithmetic number, because the mean of its divisors is an integer number (17614752750).

Almost surely, 2^661082885099 is an apocalyptic number.

661082885099 is a deficient number, since it is larger than the sum of its proper divisors (184425246901).

661082885099 is a wasteful number, since it uses less digits than its factorization.

661082885099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39820 (or 39813 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 62.

The spelling of 661082885099 in words is "six hundred sixty-one billion, eighty-two million, eight hundred eighty-five thousand, ninety-nine".