1400165656261 has 2 divisors, whose sum is σ = 1400165656262. Its totient is φ = 1400165656260.

The previous prime is 1400165656247. The next prime is 1400165656319. The reversal of 1400165656261 is 1626565610041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1145777568100 + 254388088161 = 1070410^2 + 504369^2 .

It is a cyclic number.

It is not a de Polignac number, because 1400165656261 - 2⁷ = 1400165656133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1400165656231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 700082828130 + 700082828131.

It is an arithmetic number, because the mean of its divisors is an integer number (700082828131).

Almost surely, 2^{1400165656261} is an apocalyptic number.

It is an amenable number.

1400165656261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1400165656261 is an equidigital number, since it uses as much as digits as its factorization.

1400165656261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 1400165656261 in words is "one trillion, four hundred billion, one hundred sixty-five million, six hundred fifty-six thousand, two hundred sixty-one".