40237601981 has 4 divisors (see below), whose sum is σ = 40238077632. Its totient is φ = 40237126332.

The previous prime is 40237601909. The next prime is 40237602017. The reversal of 40237601981 is 18910673204.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40237601981 - 2³⁰ = 39163860157 is a prime.

It is a super-2 number, since 2×40237601981² (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 (40237601881) 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, 72731 + ... + 292856.

It is an arithmetic number, because the mean of its divisors is an integer number (10059519408).

Almost surely, 2^40237601981 is an apocalyptic number.

It is an amenable number.

40237601981 is a deficient number, since it is larger than the sum of its proper divisors (475651).

40237601981 is a wasteful number, since it uses less digits than its factorization.

40237601981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475650.

The product of its (nonzero) digits is 72576, while the sum is 41.

The spelling of 40237601981 in words is "forty billion, two hundred thirty-seven million, six hundred one thousand, nine hundred eighty-one".