38871978877 has 2 divisors, whose sum is σ = 38871978878. Its totient is φ = 38871978876.

The previous prime is 38871978833. The next prime is 38871978889. The reversal of 38871978877 is 77887917883.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38866545316 + 5433561 = 197146^2 + 2331^2 .

It is a cyclic number.

It is not a de Polignac number, because 38871978877 - 2⁷ = 38871978749 is a prime.

It is a super-2 number, since 2×38871978877² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38871978377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19435989438 + 19435989439.

It is an arithmetic number, because the mean of its divisors is an integer number (19435989439).

Almost surely, 2^38871978877 is an apocalyptic number.

It is an amenable number.

38871978877 is a deficient number, since it is larger than the sum of its proper divisors (1).

38871978877 is an equidigital number, since it uses as much as digits as its factorization.

38871978877 is an evil number, because the sum of its binary digits is even.

The product of its digits is 265531392, while the sum is 73.

The spelling of 38871978877 in words is "thirty-eight billion, eight hundred seventy-one million, nine hundred seventy-eight thousand, eight hundred seventy-seven".