38721486978787 has 2 divisors, whose sum is σ = 38721486978788. Its totient is φ = 38721486978786.

The previous prime is 38721486978719. The next prime is 38721486978791. The reversal of 38721486978787 is 78787968412783.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 38721486978787 - 2⁷ = 38721486978659 is a prime.

It is not a weakly prime, because it can be changed into another prime (38721486970787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19360743489393 + 19360743489394.

It is an arithmetic number, because the mean of its divisors is an integer number (19360743489394).

Almost surely, 2^{38721486978787} is an apocalyptic number.

38721486978787 is a deficient number, since it is larger than the sum of its proper divisors (1).

38721486978787 is an equidigital number, since it uses as much as digits as its factorization.

38721486978787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12745506816, while the sum is 85.

The spelling of 38721486978787 in words is "thirty-eight trillion, seven hundred twenty-one billion, four hundred eighty-six million, nine hundred seventy-eight thousand, seven hundred eighty-seven".