661500056103 has 8 divisors (see below), whose sum is σ = 882004089216. Its totient is φ = 440998030200.

The previous prime is 661500056101. The next prime is 661500056137. The reversal of 661500056103 is 301650005166.

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

It is not a de Polignac number, because 661500056103 - 2¹ = 661500056101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661500056101) 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, 635248 + ... + 1313978.

It is an arithmetic number, because the mean of its divisors is an integer number (110250511152).

Almost surely, 2^661500056103 is an apocalyptic number.

661500056103 is a deficient number, since it is larger than the sum of its proper divisors (220504033113).

661500056103 is a wasteful number, since it uses less digits than its factorization.

661500056103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003605.

The product of its (nonzero) digits is 16200, while the sum is 33.

The spelling of 661500056103 in words is "six hundred sixty-one billion, five hundred million, fifty-six thousand, one hundred three".