65220457 has 2 divisors, whose sum is σ = 65220458. Its totient is φ = 65220456.

The previous prime is 65220439. The next prime is 65220473. The reversal of 65220457 is 75402256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34351321 + 30869136 = 5861^2 + 5556^2 .

It is a cyclic number.

It is not a de Polignac number, because 65220457 - 2²³ = 56831849 is a prime.

It is a super-2 number, since 2×65220457² = 8507416022577698, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (65220437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32610228 + 32610229.

It is an arithmetic number, because the mean of its divisors is an integer number (32610229).

Almost surely, 2^65220457 is an apocalyptic number.

It is an amenable number.

65220457 is a deficient number, since it is larger than the sum of its proper divisors (1).

65220457 is an equidigital number, since it uses as much as digits as its factorization.

65220457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 31.

The square root of 65220457 is about 8075.9183378734. The cubic root of 65220457 is about 402.5266255550.

The spelling of 65220457 in words is "sixty-five million, two hundred twenty thousand, four hundred fifty-seven".