40766445257 has 4 divisors (see below), whose sum is σ = 40805910420. Its totient is φ = 40726980096.

The previous prime is 40766445173. The next prime is 40766445301. The reversal of 40766445257 is 75254466704.

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 35381233801 + 5385211456 = 188099^2 + 73384^2 .

It is a cyclic number.

It is not a de Polignac number, because 40766445257 - 2²² = 40762250953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40766445157) 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, 19731032 + ... + 19733097.

It is an arithmetic number, because the mean of its divisors is an integer number (10201477605).

Almost surely, 2^40766445257 is an apocalyptic number.

It is an amenable number.

40766445257 is a deficient number, since it is larger than the sum of its proper divisors (39465163).

40766445257 is a wasteful number, since it uses less digits than its factorization.

40766445257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39465162.

The product of its (nonzero) digits is 5644800, while the sum is 50.

The spelling of 40766445257 in words is "forty billion, seven hundred sixty-six million, four hundred forty-five thousand, two hundred fifty-seven".