1223767257957 has 6 divisors (see below), whose sum is σ = 1767663817062. Its totient is φ = 815844838632.

The previous prime is 1223767257949. The next prime is 1223767257961. The reversal of 1223767257957 is 7597527673221.

1223767257957 is a `hidden beast` number, since 1 + 2 + 2 + 3 + 7 + 6 + 7 + 2 + 579 + 57 = 666.

It can be written as a sum of positive squares in only one way, i.e., 897919227396 + 325848030561 = 947586^2 + 570831^2 .

It is not a de Polignac number, because 1223767257957 - 2³ = 1223767257949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1223767257894 and 1223767257903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1223767257997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67987069878 + ... + 67987069895.

It is an arithmetic number, because the mean of its divisors is an integer number (294610636177).

Almost surely, 2^{1223767257957} is an apocalyptic number.

It is an amenable number.

1223767257957 is a deficient number, since it is larger than the sum of its proper divisors (543896559105).

1223767257957 is a wasteful number, since it uses less digits than its factorization.

1223767257957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135974139779 (or 135974139776 counting only the distinct ones).

The product of its digits is 77792400, while the sum is 63.

The spelling of 1223767257957 in words is "one trillion, two hundred twenty-three billion, seven hundred sixty-seven million, two hundred fifty-seven thousand, nine hundred fifty-seven".