40521764557 has 4 divisors (see below), whose sum is σ = 40831091136. Its totient is φ = 40212437980.

The previous prime is 40521764551. The next prime is 40521764611. The reversal of 40521764557 is 75546712504.

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 40521764557 - 2¹⁹ = 40521240269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40521764551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154663093 + ... + 154663354.

It is an arithmetic number, because the mean of its divisors is an integer number (10207772784).

Almost surely, 2^40521764557 is an apocalyptic number.

It is an amenable number.

40521764557 is a deficient number, since it is larger than the sum of its proper divisors (309326579).

40521764557 is a wasteful number, since it uses less digits than its factorization.

40521764557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309326578.

The product of its (nonzero) digits is 1176000, while the sum is 46.

The spelling of 40521764557 in words is "forty billion, five hundred twenty-one million, seven hundred sixty-four thousand, five hundred fifty-seven".