77844466739 has 16 divisors (see below), whose sum is σ = 85877836800. Its totient is φ = 70121842560.

The previous prime is 77844466729. The next prime is 77844466741. The reversal of 77844466739 is 93766444877.

It is a cyclic number.

It is not a de Polignac number, because 77844466739 - 2¹⁶ = 77844401203 is a prime.

It is a super-2 number, since 2×77844466739² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77844466729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285764 + ... + 487185.

It is an arithmetic number, because the mean of its divisors is an integer number (5367364800).

Almost surely, 2^77844466739 is an apocalyptic number.

77844466739 is a deficient number, since it is larger than the sum of its proper divisors (8033370061).

77844466739 is a wasteful number, since it uses less digits than its factorization.

77844466739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773150.

The product of its digits is 170698752, while the sum is 65.

The spelling of 77844466739 in words is "seventy-seven billion, eight hundred forty-four million, four hundred sixty-six thousand, seven hundred thirty-nine".