1261161862908 has 48 divisors (see below), whose sum is σ = 2948106685440. Its totient is φ = 419616739584.

The previous prime is 1261161862903. The next prime is 1261161862931. The reversal of 1261161862908 is 8092681611621.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261161862903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49758903 + ... + 49784241.

It is an arithmetic number, because the mean of its divisors is an integer number (61418889280).

Almost surely, 2^{1261161862908} is an apocalyptic number.

It is an amenable number.

1261161862908 is an abundant number, since it is smaller than the sum of its proper divisors (1686944822532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1261161862908 is a wasteful number, since it uses less digits than its factorization.

1261161862908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32786 (or 32784 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 51.

The spelling of 1261161862908 in words is "one trillion, two hundred sixty-one billion, one hundred sixty-one million, eight hundred sixty-two thousand, nine hundred eight".