40531663821 has 16 divisors (see below), whose sum is σ = 59046865920. Its totient is φ = 24526428720.

The previous prime is 40531663811. The next prime is 40531663831. The reversal of 40531663821 is 12836613504.

It is an interprime number because it is at equal distance from previous prime (40531663811) and next prime (40531663831).

It is not a de Polignac number, because 40531663821 - 2⁷ = 40531663693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40531663821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40531663811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 933861 + ... + 976298.

It is an arithmetic number, because the mean of its divisors is an integer number (3690429120).

Almost surely, 2^40531663821 is an apocalyptic number.

It is an amenable number.

40531663821 is a deficient number, since it is larger than the sum of its proper divisors (18515202099).

40531663821 is a wasteful number, since it uses less digits than its factorization.

40531663821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910816.

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 40531663821 in words is "forty billion, five hundred thirty-one million, six hundred sixty-three thousand, eight hundred twenty-one".