77346417721 has 16 divisors (see below), whose sum is σ = 82068497280. Its totient is φ = 72738673920.

The previous prime is 77346417703. The next prime is 77346417739. The reversal of 77346417721 is 12771464377.

It is an interprime number because it is at equal distance from previous prime (77346417703) and next prime (77346417739).

It is not a de Polignac number, because 77346417721 - 2⁹ = 77346417209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77346417791) 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, 3551361 + ... + 3573073.

It is an arithmetic number, because the mean of its divisors is an integer number (5129281080).

Almost surely, 2^77346417721 is an apocalyptic number.

It is an amenable number.

77346417721 is a deficient number, since it is larger than the sum of its proper divisors (4722079559).

77346417721 is a wasteful number, since it uses less digits than its factorization.

77346417721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24336.

The product of its digits is 1382976, while the sum is 49.

The spelling of 77346417721 in words is "seventy-seven billion, three hundred forty-six million, four hundred seventeen thousand, seven hundred twenty-one".