77744391973 has 8 divisors (see below), whose sum is σ = 78283423040. Its totient is φ = 77205679200.

The previous prime is 77744391937. The next prime is 77744392001. The reversal of 77744391973 is 37919344777.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77744391973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77744311973) 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, 421513 + ... + 577201.

It is an arithmetic number, because the mean of its divisors is an integer number (9785427880).

Almost surely, 2^77744391973 is an apocalyptic number.

It is an amenable number.

77744391973 is a deficient number, since it is larger than the sum of its proper divisors (539031067).

77744391973 is a wasteful number, since it uses less digits than its factorization.

77744391973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159147.

The product of its digits is 28005264, while the sum is 61.

The spelling of 77744391973 in words is "seventy-seven billion, seven hundred forty-four million, three hundred ninety-one thousand, nine hundred seventy-three".