1261522506442 has 16 divisors (see below), whose sum is σ = 2095120148832. Its totient is φ = 564860823120.

The previous prime is 1261522506427. The next prime is 1261522506463. The reversal of 1261522506442 is 2446052251621.

It is a junction number, because it is equal to n+sod(n) for n = 1261522506395 and 1261522506404.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427923393 + ... + 427926340.

It is an arithmetic number, because the mean of its divisors is an integer number (130945009302).

Almost surely, 2^{1261522506442} is an apocalyptic number.

1261522506442 is a deficient number, since it is larger than the sum of its proper divisors (833597642390).

1261522506442 is a wasteful number, since it uses less digits than its factorization.

1261522506442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855849813.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 1261522506442 in words is "one trillion, two hundred sixty-one billion, five hundred twenty-two million, five hundred six thousand, four hundred forty-two".