40525166521 has 4 divisors (see below), whose sum is σ = 46314476032. Its totient is φ = 34735857012.

The previous prime is 40525166497. The next prime is 40525166531. The reversal of 40525166521 is 12566152504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40525166521 - 2¹³ = 40525158329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40525166531) 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, 2894654745 + ... + 2894654758.

It is an arithmetic number, because the mean of its divisors is an integer number (11578619008).

Almost surely, 2^40525166521 is an apocalyptic number.

It is an amenable number.

40525166521 is a deficient number, since it is larger than the sum of its proper divisors (5789309511).

40525166521 is an equidigital number, since it uses as much as digits as its factorization.

40525166521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5789309510.

The product of its (nonzero) digits is 72000, while the sum is 37.

It can be divided in two parts, 40525 and 166521, that added together give a triangular number (207046 = T₆₄₃).

The spelling of 40525166521 in words is "forty billion, five hundred twenty-five million, one hundred sixty-six thousand, five hundred twenty-one".