77215093387 has 2 divisors, whose sum is σ = 77215093388. Its totient is φ = 77215093386.

The previous prime is 77215093367. The next prime is 77215093411. The reversal of 77215093387 is 78339051277.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77215093387 - 2¹¹ = 77215091339 is a prime.

It is a super-2 number, since 2×77215093387² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77215093367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38607546693 + 38607546694.

It is an arithmetic number, because the mean of its divisors is an integer number (38607546694).

Almost surely, 2^77215093387 is an apocalyptic number.

77215093387 is a deficient number, since it is larger than the sum of its proper divisors (1).

77215093387 is an equidigital number, since it uses as much as digits as its factorization.

77215093387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2222640, while the sum is 52.

The spelling of 77215093387 in words is "seventy-seven billion, two hundred fifteen million, ninety-three thousand, three hundred eighty-seven".