661005625640103 has 48 divisors (see below), whose sum is σ = 969607166688160. Its totient is φ = 433852128460800.

The previous prime is 661005625640093. The next prime is 661005625640131. The reversal of 661005625640103 is 301046526500166.

661005625640103 is a `hidden beast` number, since 6 + 6 + 1 + 0 + 0 + 5 + 625 + 6 + 4 + 0 + 10 + 3 = 666.

It is not a de Polignac number, because 661005625640103 - 2⁸ = 661005625639847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661005625640183) 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, 1015698273 + ... + 1016348853.

Almost surely, 2^{661005625640103} is an apocalyptic number.

661005625640103 is a deficient number, since it is larger than the sum of its proper divisors (308601541048057).

661005625640103 is a wasteful number, since it uses less digits than its factorization.

661005625640103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 653440 (or 653437 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 45.

The spelling of 661005625640103 in words is "six hundred sixty-one trillion, five billion, six hundred twenty-five million, six hundred forty thousand, one hundred three".