136440400023640 has 32 divisors (see below), whose sum is σ = 312023537764560. Its totient is φ = 53681468860800.

The previous prime is 136440400023617. The next prime is 136440400023649. The reversal of 136440400023640 is 46320004044631.

It is a super-2 number, since 2×136440400023640² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 136440400023640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136440400023649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27959095926 + ... + 27959100805.

Almost surely, 2^{136440400023640} is an apocalyptic number.

136440400023640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136440400023640 is an abundant number, since it is smaller than the sum of its proper divisors (175583137740920).

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

136440400023640 is a wasteful number, since it uses less digits than its factorization.

136440400023640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55918196803 (or 55918196799 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 37.

The spelling of 136440400023640 in words is "one hundred thirty-six trillion, four hundred forty billion, four hundred million, twenty-three thousand, six hundred forty".