1261115610530 has 64 divisors (see below), whose sum is σ = 2402031850848. Its totient is φ = 476072663040.

The previous prime is 1261115610529. The next prime is 1261115610577. The reversal of 1261115610530 is 350165111621.

It can be written as a sum of positive squares in 16 ways, for example, as 78866050561 + 1182249559969 = 280831^2 + 1087313^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2384144 + ... + 2864676.

Almost surely, 2^{1261115610530} is an apocalyptic number.

1261115610530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1261115610530 is a deficient number, since it is larger than the sum of its proper divisors (1140916240318).

1261115610530 is a wasteful number, since it uses less digits than its factorization.

1261115610530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480791.

The product of its (nonzero) digits is 5400, while the sum is 32.

The spelling of 1261115610530 in words is "one trillion, two hundred sixty-one billion, one hundred fifteen million, six hundred ten thousand, five hundred thirty".