661555150600 has 48 divisors (see below), whose sum is σ = 1540310225220. Its totient is φ = 264244512000.

The previous prime is 661555150519. The next prime is 661555150667. The reversal of 661555150600 is 6051555166.

It can be written as a sum of positive squares in 6 ways, for example, as 367068763044 + 294486387556 = 605862^2 + 542666^2 .

It is a super-3 number, since 3×661555150600³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2219127 + ... + 2499526.

Almost surely, 2^661555150600 is an apocalyptic number.

It is an amenable number.

661555150600 is an abundant number, since it is smaller than the sum of its proper divisors (878755074620).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661555150600 is a wasteful number, since it uses less digits than its factorization.

661555150600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4719370 (or 4719361 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 40.

The spelling of 661555150600 in words is "six hundred sixty-one billion, five hundred fifty-five million, one hundred fifty thousand, six hundred".