1434772778821 has 2 divisors, whose sum is σ = 1434772778822. Its totient is φ = 1434772778820.

The previous prime is 1434772778809. The next prime is 1434772778863. The reversal of 1434772778821 is 1288772774341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1432162692900 + 2610085921 = 1196730^2 + 51089^2 .

It is a cyclic number.

It is not a de Polignac number, because 1434772778821 - 2²⁵ = 1434739224389 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1434772778821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1434772778221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 717386389410 + 717386389411.

It is an arithmetic number, because the mean of its divisors is an integer number (717386389411).

Almost surely, 2^{1434772778821} is an apocalyptic number.

It is an amenable number.

1434772778821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1434772778821 is an equidigital number, since it uses as much as digits as its factorization.

1434772778821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29503488, while the sum is 61.

The spelling of 1434772778821 in words is "one trillion, four hundred thirty-four billion, seven hundred seventy-two million, seven hundred seventy-eight thousand, eight hundred twenty-one".