65406557 has 2 divisors, whose sum is σ = 65406558. Its totient is φ = 65406556.

The previous prime is 65406533. The next prime is 65406577. The reversal of 65406557 is 75560456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51351556 + 14055001 = 7166^2 + 3749^2 .

It is a cyclic number.

It is not a de Polignac number, because 65406557 - 2⁸ = 65406301 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 65406557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65406577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32703278 + 32703279.

It is an arithmetic number, because the mean of its divisors is an integer number (32703279).

Almost surely, 2^65406557 is an apocalyptic number.

It is an amenable number.

65406557 is a deficient number, since it is larger than the sum of its proper divisors (1).

65406557 is an equidigital number, since it uses as much as digits as its factorization.

65406557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 126000, while the sum is 38.

The square root of 65406557 is about 8087.4320398999. The cubic root of 65406557 is about 402.9091183679.

The spelling of 65406557 in words is "sixty-five million, four hundred six thousand, five hundred fifty-seven".