1261342521524 has 6 divisors (see below), whose sum is σ = 2207349412674. Its totient is φ = 630671260760.

The previous prime is 1261342521511. The next prime is 1261342521541. The reversal of 1261342521524 is 4251252431621.

It can be written as a sum of positive squares in only one way, i.e., 1195129968400 + 66212553124 = 1093220^2 + 257318^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157667815187 + ... + 157667815194.

It is an arithmetic number, because the mean of its divisors is an integer number (367891568779).

Almost surely, 2^{1261342521524} is an apocalyptic number.

It is an amenable number.

1261342521524 is a deficient number, since it is larger than the sum of its proper divisors (946006891150).

1261342521524 is a wasteful number, since it uses less digits than its factorization.

1261342521524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315335630385 (or 315335630383 counting only the distinct ones).

The product of its digits is 115200, while the sum is 38.

The spelling of 1261342521524 in words is "one trillion, two hundred sixty-one billion, three hundred forty-two million, five hundred twenty-one thousand, five hundred twenty-four".