646598153 has 2 divisors, whose sum is σ = 646598154. Its totient is φ = 646598152.

The previous prime is 646598143. The next prime is 646598159. The reversal of 646598153 is 351895646.

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., 335146249 + 311451904 = 18307^2 + 17648^2 .

It is a cyclic number.

It is not a de Polignac number, because 646598153 - 2¹⁰ = 646597129 is a prime.

It is a super-2 number, since 2×646598153² = 836178342926022818, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646598098 and 646598107.

It is not a weakly prime, because it can be changed into another prime (646598159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323299076 + 323299077.

It is an arithmetic number, because the mean of its divisors is an integer number (323299077).

Almost surely, 2^646598153 is an apocalyptic number.

It is an amenable number.

646598153 is a deficient number, since it is larger than the sum of its proper divisors (1).

646598153 is an equidigital number, since it uses as much as digits as its factorization.

646598153 is an evil number, because the sum of its binary digits is even.

The product of its digits is 777600, while the sum is 47.

The square root of 646598153 is about 25428.2943391805. The cubic root of 646598153 is about 864.7252752254.

The spelling of 646598153 in words is "six hundred forty-six million, five hundred ninety-eight thousand, one hundred fifty-three".