36840866261 has 2 divisors, whose sum is σ = 36840866262. Its totient is φ = 36840866260.

The previous prime is 36840866191. The next prime is 36840866263. The reversal of 36840866261 is 16266804863.

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., 32627558161 + 4213308100 = 180631^2 + 64910^2 .

It is a cyclic number.

It is not a de Polignac number, because 36840866261 - 2²² = 36836671957 is a prime.

Together with 36840866263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (36840866263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18420433130 + 18420433131.

It is an arithmetic number, because the mean of its divisors is an integer number (18420433131).

Almost surely, 2^36840866261 is an apocalyptic number.

It is an amenable number.

36840866261 is a deficient number, since it is larger than the sum of its proper divisors (1).

36840866261 is an equidigital number, since it uses as much as digits as its factorization.

36840866261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 36840866261 in words is "thirty-six billion, eight hundred forty million, eight hundred sixty-six thousand, two hundred sixty-one".