311778643045 has 8 divisors (see below), whose sum is σ = 374142531096. Its totient is φ = 249417474816.

The previous prime is 311778643021. The next prime is 311778643049. The reversal of 311778643045 is 540346877113.

It can be written as a sum of positive squares in 4 ways, for example, as 595408801 + 311183234244 = 24401^2 + 557838^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 311778643045 - 2¹¹ = 311778640997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311778643045.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311778643049) 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, 418632 + ... + 893761.

It is an arithmetic number, because the mean of its divisors is an integer number (46767816387).

Almost surely, 2^311778643045 is an apocalyptic number.

It is an amenable number.

311778643045 is a deficient number, since it is larger than the sum of its proper divisors (62363888051).

311778643045 is a wasteful number, since it uses less digits than its factorization.

311778643045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1359911.

The product of its (nonzero) digits is 1693440, while the sum is 49.

The spelling of 311778643045 in words is "three hundred eleven billion, seven hundred seventy-eight million, six hundred forty-three thousand, forty-five".