1261365205102 has 4 divisors (see below), whose sum is σ = 1892047807656. Its totient is φ = 630682602550.

The previous prime is 1261365205073. The next prime is 1261365205109. The reversal of 1261365205102 is 2015025631621.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261365205109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315341301274 + ... + 315341301277.

It is an arithmetic number, because the mean of its divisors is an integer number (473011951914).

Almost surely, 2^{1261365205102} is an apocalyptic number.

1261365205102 is a deficient number, since it is larger than the sum of its proper divisors (630682602554).

1261365205102 is an equidigital number, since it uses as much as digits as its factorization.

1261365205102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630682602553.

The product of its (nonzero) digits is 21600, while the sum is 34.

The spelling of 1261365205102 in words is "one trillion, two hundred sixty-one billion, three hundred sixty-five million, two hundred five thousand, one hundred two".