1145261643261 has 8 divisors (see below), whose sum is σ = 1527020924064. Its totient is φ = 763505062320.

The previous prime is 1145261643221. The next prime is 1145261643299. The reversal of 1145261643261 is 1623461625411.

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

It is not a de Polignac number, because 1145261643261 - 2²⁶ = 1145194534397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1145261643221) 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, 736450 + ... + 1683116.

It is an arithmetic number, because the mean of its divisors is an integer number (190877615508).

Almost surely, 2^{1145261643261} is an apocalyptic number.

It is an amenable number.

1145261643261 is a deficient number, since it is larger than the sum of its proper divisors (381759280803).

1145261643261 is an equidigital number, since it uses as much as digits as its factorization.

1145261643261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1349931.

The product of its digits is 207360, while the sum is 42.

The spelling of 1145261643261 in words is "one trillion, one hundred forty-five billion, two hundred sixty-one million, six hundred forty-three thousand, two hundred sixty-one".