79944427381 has 12 divisors (see below), whose sum is σ = 98933764512. Its totient is φ = 63252732816.

The previous prime is 79944427351. The next prime is 79944427391. The reversal of 79944427381 is 18372444997.

It is a happy number.

It is not a de Polignac number, because 79944427381 - 2⁷ = 79944427253 is a prime.

It is a super-2 number, since 2×79944427381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79944427351) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33787671 + ... + 33790036.

It is an arithmetic number, because the mean of its divisors is an integer number (8244480376).

Almost surely, 2^79944427381 is an apocalyptic number.

It is an amenable number.

79944427381 is a deficient number, since it is larger than the sum of its proper divisors (18989337131).

79944427381 is a wasteful number, since it uses less digits than its factorization.

79944427381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67577740 (or 67577727 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 58.

The spelling of 79944427381 in words is "seventy-nine billion, nine hundred forty-four million, four hundred twenty-seven thousand, three hundred eighty-one".