661122477 has 24 divisors (see below), whose sum is σ = 976939704. Its totient is φ = 430669824.

The previous prime is 661122457. The next prime is 661122479. The reversal of 661122477 is 774221166.

661122477 is a `hidden beast` number, since 6 + 61 + 122 + 477 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 536107716 + 125014761 = 23154^2 + 11181^2 .

It is not a de Polignac number, because 661122477 - 2¹⁶ = 661056941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661122479) 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, 119893 + ... + 125285.

It is an arithmetic number, because the mean of its divisors is an integer number (40705821).

Almost surely, 2^661122477 is an apocalyptic number.

It is an amenable number.

661122477 is a deficient number, since it is larger than the sum of its proper divisors (315817227).

661122477 is a wasteful number, since it uses less digits than its factorization.

661122477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5709 (or 5706 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 661122477 is about 25712.3020556309. The cubic root of 661122477 is about 871.1520726176.

The spelling of 661122477 in words is "six hundred sixty-one million, one hundred twenty-two thousand, four hundred seventy-seven".