64956787261 has 2 divisors, whose sum is σ = 64956787262. Its totient is φ = 64956787260.

The previous prime is 64956787171. The next prime is 64956787271. The reversal of 64956787261 is 16278765946.

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., 36073784761 + 28883002500 = 189931^2 + 169950^2 .

It is a cyclic number.

It is not a de Polignac number, because 64956787261 - 2⁹ = 64956786749 is a prime.

It is a super-2 number, since 2×64956787261² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64956787261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64956787271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32478393630 + 32478393631.

It is an arithmetic number, because the mean of its divisors is an integer number (32478393631).

Almost surely, 2^64956787261 is an apocalyptic number.

It is an amenable number.

64956787261 is a deficient number, since it is larger than the sum of its proper divisors (1).

64956787261 is an equidigital number, since it uses as much as digits as its factorization.

64956787261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30481920, while the sum is 61.

The spelling of 64956787261 in words is "sixty-four billion, nine hundred fifty-six million, seven hundred eighty-seven thousand, two hundred sixty-one".