6466770776645 has 16 divisors (see below), whose sum is σ = 7847494662960. Its totient is φ = 5115172761600.

The previous prime is 6466770776633. The next prime is 6466770776647. The reversal of 6466770776645 is 5466770776646.

It can be written as a sum of positive squares in 8 ways, for example, as 55756904641 + 6411013872004 = 236129^2 + 2531998^2 .

It is not a de Polignac number, because 6466770776645 - 2³⁶ = 6398051299909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6466770776647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23323025 + ... + 23598665.

It is an arithmetic number, because the mean of its divisors is an integer number (490468416435).

Almost surely, 2^{6466770776645} is an apocalyptic number.

It is an amenable number.

6466770776645 is a deficient number, since it is larger than the sum of its proper divisors (1380723886315).

6466770776645 is a wasteful number, since it uses less digits than its factorization.

6466770776645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328456.

The product of its (nonzero) digits is 1493614080, while the sum is 71.

Subtracting from 6466770776645 its reverse (5466770776646), we obtain a palindrome (999999999999).

The spelling of 6466770776645 in words is "six trillion, four hundred sixty-six billion, seven hundred seventy million, seven hundred seventy-six thousand, six hundred forty-five".