138779361587 has 2 divisors, whose sum is σ = 138779361588. Its totient is φ = 138779361586.

The previous prime is 138779361563. The next prime is 138779361619. The reversal of 138779361587 is 785163977831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138779361587 - 2³⁴ = 121599492403 is a prime.

It is a super-2 number, since 2×138779361587² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (138779364587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69389680793 + 69389680794.

It is an arithmetic number, because the mean of its divisors is an integer number (69389680794).

Almost surely, 2^138779361587 is an apocalyptic number.

138779361587 is a deficient number, since it is larger than the sum of its proper divisors (1).

138779361587 is an equidigital number, since it uses as much as digits as its factorization.

138779361587 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53343360, while the sum is 65.

The spelling of 138779361587 in words is "one hundred thirty-eight billion, seven hundred seventy-nine million, three hundred sixty-one thousand, five hundred eighty-seven".