65378657 has 2 divisors, whose sum is σ = 65378658. Its totient is φ = 65378656.

The previous prime is 65378633. The next prime is 65378671. The reversal of 65378657 is 75687356.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62789776 + 2588881 = 7924^2 + 1609^2 .

It is a cyclic number.

It is not a de Polignac number, because 65378657 - 2²⁰ = 64330081 is a prime.

It is a super-2 number, since 2×65378657² = 8548737582247298, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65378057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32689328 + 32689329.

It is an arithmetic number, because the mean of its divisors is an integer number (32689329).

Almost surely, 2^65378657 is an apocalyptic number.

It is an amenable number.

65378657 is a deficient number, since it is larger than the sum of its proper divisors (1).

65378657 is an equidigital number, since it uses as much as digits as its factorization.

65378657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1058400, while the sum is 47.

The square root of 65378657 is about 8085.7069573415. The cubic root of 65378657 is about 402.8518215481.

The spelling of 65378657 in words is "sixty-five million, three hundred seventy-eight thousand, six hundred fifty-seven".