239903978537 has 2 divisors, whose sum is σ = 239903978538. Its totient is φ = 239903978536.

The previous prime is 239903978491. The next prime is 239903978539. The reversal of 239903978537 is 735879309932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 225286926736 + 14617051801 = 474644^2 + 120901^2 .

It is a cyclic number.

It is not a de Polignac number, because 239903978537 - 2¹⁶ = 239903913001 is a prime.

Together with 239903978539, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (239903978539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119951989268 + 119951989269.

It is an arithmetic number, because the mean of its divisors is an integer number (119951989269).

Almost surely, 2^239903978537 is an apocalyptic number.

It is an amenable number.

239903978537 is a deficient number, since it is larger than the sum of its proper divisors (1).

239903978537 is an equidigital number, since it uses as much as digits as its factorization.

239903978537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77157360, while the sum is 65.

The spelling of 239903978537 in words is "two hundred thirty-nine billion, nine hundred three million, nine hundred seventy-eight thousand, five hundred thirty-seven".