661767255 has 24 divisors (see below), whose sum is σ = 1149456672. Its totient is φ = 352206144.

The previous prime is 661767229. The next prime is 661767277. The reversal of 661767255 is 552767166.

661767255 is a `hidden beast` number, since 6 + 617 + 6 + 7 + 25 + 5 = 666.

It is not a de Polignac number, because 661767255 - 2¹¹ = 661765207 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 661767255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6817 + ... + 37013.

It is an arithmetic number, because the mean of its divisors is an integer number (47894028).

Almost surely, 2^661767255 is an apocalyptic number.

661767255 is a deficient number, since it is larger than the sum of its proper divisors (487689417).

661767255 is a wasteful number, since it uses less digits than its factorization.

661767255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30695 (or 30692 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 661767255 is about 25724.8373172699. The cubic root of 661767255 is about 871.4351856590.

The spelling of 661767255 in words is "six hundred sixty-one million, seven hundred sixty-seven thousand, two hundred fifty-five".