1161261613621 has 8 divisors (see below), whose sum is σ = 1164141517824. Its totient is φ = 1158382569360.

The previous prime is 1161261613609. The next prime is 1161261613637. The reversal of 1161261613621 is 1263161621611.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1161261613621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1161261613021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2532591 + ... + 2955763.

It is an arithmetic number, because the mean of its divisors is an integer number (145517689728).

Almost surely, 2^{1161261613621} is an apocalyptic number.

It is an amenable number.

1161261613621 is a deficient number, since it is larger than the sum of its proper divisors (2879904203).

1161261613621 is an equidigital number, since it uses as much as digits as its factorization.

1161261613621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429971.

The product of its digits is 15552, while the sum is 37.

The spelling of 1161261613621 in words is "one trillion, one hundred sixty-one billion, two hundred sixty-one million, six hundred thirteen thousand, six hundred twenty-one".