65781437750425 has 24 divisors (see below), whose sum is σ = 82218870766592. Its totient is φ = 52205944392000.

The previous prime is 65781437750419. The next prime is 65781437750443. The reversal of 65781437750425 is 52405773418756.

It is a happy number.

It is not a de Polignac number, because 65781437750425 - 2⁷ = 65781437750297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33529870 + ... + 35437480.

Almost surely, 2^{65781437750425} is an apocalyptic number.

It is an amenable number.

65781437750425 is a deficient number, since it is larger than the sum of its proper divisors (16437433016167).

65781437750425 is a wasteful number, since it uses less digits than its factorization.

65781437750425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918609 (or 1918604 counting only the distinct ones).

The product of its (nonzero) digits is 197568000, while the sum is 64.

The spelling of 65781437750425 in words is "sixty-five trillion, seven hundred eighty-one billion, four hundred thirty-seven million, seven hundred fifty thousand, four hundred twenty-five".