40170971261 has 2 divisors, whose sum is σ = 40170971262. Its totient is φ = 40170971260.

The previous prime is 40170971257. The next prime is 40170971279. The reversal of 40170971261 is 16217907104.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34058702500 + 6112268761 = 184550^2 + 78181^2 .

It is a cyclic number.

It is not a de Polignac number, because 40170971261 - 2² = 40170971257 is a prime.

It is a super-2 number, since 2×40170971261² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40170971201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20085485630 + 20085485631.

It is an arithmetic number, because the mean of its divisors is an integer number (20085485631).

Almost surely, 2^40170971261 is an apocalyptic number.

It is an amenable number.

40170971261 is a deficient number, since it is larger than the sum of its proper divisors (1).

40170971261 is an equidigital number, since it uses as much as digits as its factorization.

40170971261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21168, while the sum is 38.

The spelling of 40170971261 in words is "forty billion, one hundred seventy million, nine hundred seventy-one thousand, two hundred sixty-one".