77744249854 has 16 divisors (see below), whose sum is σ = 119778197616. Its totient is φ = 37818360000.

The previous prime is 77744249851. The next prime is 77744249879. The reversal of 77744249854 is 45894244777.

It is a super-3 number, since 3×77744249854³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 77744249792 and 77744249801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77744249851) 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, 1017714 + ... + 1091434.

It is an arithmetic number, because the mean of its divisors is an integer number (7486137351).

Almost surely, 2^77744249854 is an apocalyptic number.

77744249854 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

77744249854 is a deficient number, since it is larger than the sum of its proper divisors (42033947762).

77744249854 is a wasteful number, since it uses less digits than its factorization.

77744249854 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88011.

The product of its digits is 63221760, while the sum is 61.

The spelling of 77744249854 in words is "seventy-seven billion, seven hundred forty-four million, two hundred forty-nine thousand, eight hundred fifty-four".