78533451644650 has 12 divisors (see below), whose sum is σ = 146072220059142. Its totient is φ = 31413380657840.

The previous prime is 78533451644623. The next prime is 78533451644651. The reversal of 78533451644650 is 5644615433587.

It can be written as a sum of positive squares in 3 ways, for example, as 58950286612281 + 19583165032369 = 7677909^2 + 4425287^2 .

It is not an unprimeable number, because it can be changed into a prime (78533451644651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 785334516397 + ... + 785334516496.

Almost surely, 2^{78533451644650} is an apocalyptic number.

78533451644650 is a deficient number, since it is larger than the sum of its proper divisors (67538768414492).

78533451644650 is a wasteful number, since it uses less digits than its factorization.

78533451644650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570669032905 (or 1570669032900 counting only the distinct ones).

The product of its (nonzero) digits is 145152000, while the sum is 61.

The spelling of 78533451644650 in words is "seventy-eight trillion, five hundred thirty-three billion, four hundred fifty-one million, six hundred forty-four thousand, six hundred fifty".