1261603766434 has 16 divisors (see below), whose sum is σ = 2065448174400. Its totient is φ = 573176910960.

The previous prime is 1261603766417. The next prime is 1261603766473. The reversal of 1261603766434 is 4346673061621.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13921134 + ... + 14011465.

It is an arithmetic number, because the mean of its divisors is an integer number (129090510900).

Almost surely, 2^{1261603766434} is an apocalyptic number.

1261603766434 is a deficient number, since it is larger than the sum of its proper divisors (803844407966).

1261603766434 is a wasteful number, since it uses less digits than its factorization.

1261603766434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27934665.

The product of its (nonzero) digits is 2612736, while the sum is 49.

The spelling of 1261603766434 in words is "one trillion, two hundred sixty-one billion, six hundred three million, seven hundred sixty-six thousand, four hundred thirty-four".