77946251450 has 12 divisors (see below), whose sum is σ = 144980027790. Its totient is φ = 31178500560.

The previous prime is 77946251441. The next prime is 77946251459. The reversal of 77946251450 is 5415264977.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77946251441) and next prime (77946251459).

It can be written as a sum of positive squares in 3 ways, for example, as 56149567681 + 21796683769 = 236959^2 + 147637^2 .

It is a Harshad number since it is a multiple of its sum of digits (50), and also a Moran number because the ratio is a prime number: 1558925029 = 77946251450 / (7 + 7 + 9 + 4 + 6 + 2 + 5 + 1 + 4 + 5 + 0).

It is not an unprimeable number, because it can be changed into a prime (77946251459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 779462465 + ... + 779462564.

Almost surely, 2^77946251450 is an apocalyptic number.

77946251450 is a deficient number, since it is larger than the sum of its proper divisors (67033776340).

77946251450 is a wasteful number, since it uses less digits than its factorization.

77946251450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558925041 (or 1558925036 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 50.

The spelling of 77946251450 in words is "seventy-seven billion, nine hundred forty-six million, two hundred fifty-one thousand, four hundred fifty".