40313251644 has 12 divisors (see below), whose sum is σ = 94064253864. Its totient is φ = 13437750544.

The previous prime is 40313251639. The next prime is 40313251651. The reversal of 40313251644 is 44615231304.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×40313251644² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1679718807 + ... + 1679718830.

It is an arithmetic number, because the mean of its divisors is an integer number (7838687822).

Almost surely, 2^40313251644 is an apocalyptic number.

It is an amenable number.

40313251644 is an abundant number, since it is smaller than the sum of its proper divisors (53751002220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40313251644 is a wasteful number, since it uses less digits than its factorization.

40313251644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3359437644 (or 3359437642 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 40313251644 its reverse (44615231304), we get a palindrome (84928482948).

The spelling of 40313251644 in words is "forty billion, three hundred thirteen million, two hundred fifty-one thousand, six hundred forty-four".