661451046255 has 24 divisors (see below), whose sum is σ = 1154107974240. Its totient is φ = 350437636800.

The previous prime is 661451046251. The next prime is 661451046281. The reversal of 661451046255 is 552640154166.

661451046255 is a `hidden beast` number, since 6 + 6 + 1 + 4 + 5 + 10 + 4 + 625 + 5 = 666.

It is not a de Polignac number, because 661451046255 - 2² = 661451046251 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 661451046255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661451046251) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48665100 + ... + 48678689.

It is an arithmetic number, because the mean of its divisors is an integer number (48087832260).

Almost surely, 2^661451046255 is an apocalyptic number.

661451046255 is a deficient number, since it is larger than the sum of its proper divisors (492656927985).

661451046255 is a wasteful number, since it uses less digits than its factorization.

661451046255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97343951 (or 97343948 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 661451046255 in words is "six hundred sixty-one billion, four hundred fifty-one million, forty-six thousand, two hundred fifty-five".