6420136121860 has 48 divisors (see below), whose sum is σ = 13494098983680. Its totient is φ = 2565805328640.

The previous prime is 6420136121849. The next prime is 6420136121863. The reversal of 6420136121860 is 681216310246.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6420136121863) 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, 111259896 + ... + 111317584.

It is an arithmetic number, because the mean of its divisors is an integer number (281127062160).

Almost surely, 2^{6420136121860} is an apocalyptic number.

It is an amenable number.

6420136121860 is an abundant number, since it is smaller than the sum of its proper divisors (7073962861820).

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

6420136121860 is a wasteful number, since it uses less digits than its factorization.

6420136121860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62476 (or 62474 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The spelling of 6420136121860 in words is "six trillion, four hundred twenty billion, one hundred thirty-six million, one hundred twenty-one thousand, eight hundred sixty".