661625503036 has 12 divisors (see below), whose sum is σ = 1175125893928. Its totient is φ = 325875247632.

The previous prime is 661625503027. The next prime is 661625503039. The reversal of 661625503036 is 630305526166.

It is a junction number, because it is equal to n+sod(n) for n = 661625502983 and 661625503001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661625503039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1234375671 + ... + 1234376206.

Almost surely, 2^661625503036 is an apocalyptic number.

It is an amenable number.

661625503036 is a deficient number, since it is larger than the sum of its proper divisors (513500390892).

661625503036 is a wasteful number, since it uses less digits than its factorization.

661625503036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2468751948 (or 2468751946 counting only the distinct ones).

The product of its (nonzero) digits is 583200, while the sum is 43.

The spelling of 661625503036 in words is "six hundred sixty-one billion, six hundred twenty-five million, five hundred three thousand, thirty-six".