40125965261 has 4 divisors (see below), whose sum is σ = 40675636092. Its totient is φ = 39576294432.

The previous prime is 40125965237. The next prime is 40125965267. The reversal of 40125965261 is 16256952104.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11128984036 + 28996981225 = 105494^2 + 170285^2 .

It is a cyclic number.

It is not a de Polignac number, because 40125965261 - 2⁶ = 40125965197 is a prime.

It is a super-2 number, since 2×40125965261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40125965267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274835306 + ... + 274835451.

It is an arithmetic number, because the mean of its divisors is an integer number (10168909023).

Almost surely, 2^40125965261 is an apocalyptic number.

It is an amenable number.

40125965261 is a deficient number, since it is larger than the sum of its proper divisors (549670831).

40125965261 is an equidigital number, since it uses as much as digits as its factorization.

40125965261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549670830.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 40125965261 in words is "forty billion, one hundred twenty-five million, nine hundred sixty-five thousand, two hundred sixty-one".