6520400969 has 2 divisors, whose sum is σ = 6520400970. Its totient is φ = 6520400968.

The previous prime is 6520400947. The next prime is 6520400987. The reversal of 6520400969 is 9690040256.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4400995600 + 2119405369 = 66340^2 + 46037^2 .

It is a cyclic number.

It is not a de Polignac number, because 6520400969 - 2¹⁶ = 6520335433 is a prime.

It is a super-2 number, since 2×6520400969² = 85031257593072277922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6520400669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260200484 + 3260200485.

It is an arithmetic number, because the mean of its divisors is an integer number (3260200485).

Almost surely, 2^6520400969 is an apocalyptic number.

It is an amenable number.

6520400969 is a deficient number, since it is larger than the sum of its proper divisors (1).

6520400969 is an equidigital number, since it uses as much as digits as its factorization.

6520400969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 116640, while the sum is 41.

The square root of 6520400969 is about 80748.9998018551. Note that the first 3 decimals coincide. The cubic root of 6520400969 is about 1868.2060224580.

The spelling of 6520400969 in words is "six billion, five hundred twenty million, four hundred thousand, nine hundred sixty-nine".