77523563381 has 8 divisors (see below), whose sum is σ = 86537931744. Its totient is φ = 68836990320.

The previous prime is 77523563339. The next prime is 77523563423. The reversal of 77523563381 is 18336532577.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (77523563339) and next prime (77523563423).

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

It is not a de Polignac number, because 77523563381 - 2¹⁰ = 77523562357 is a prime.

It is a super-2 number, since 2×77523563381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77523563311) 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, 81948326 + ... + 81949271.

It is an arithmetic number, because the mean of its divisors is an integer number (10817241468).

Almost surely, 2^77523563381 is an apocalyptic number.

It is an amenable number.

77523563381 is a deficient number, since it is larger than the sum of its proper divisors (9014368363).

77523563381 is a wasteful number, since it uses less digits than its factorization.

77523563381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163897651.

The product of its digits is 3175200, while the sum is 50.

The spelling of 77523563381 in words is "seventy-seven billion, five hundred twenty-three million, five hundred sixty-three thousand, three hundred eighty-one".