6401431694238 has 64 divisors (see below), whose sum is σ = 14850498216960. Its totient is φ = 1801692345600.

The previous prime is 6401431694237. The next prime is 6401431694249. The reversal of 6401431694238 is 8324961341046.

It is a super-2 number, since 2×6401431694238² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401431694233) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2612898 + ... + 4430586.

It is an arithmetic number, because the mean of its divisors is an integer number (232039034640).

Almost surely, 2^{6401431694238} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6401431694238, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7425249108480).

6401431694238 is an abundant number, since it is smaller than the sum of its proper divisors (8449066522722).

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

6401431694238 is a wasteful number, since it uses less digits than its factorization.

6401431694238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818953.

The product of its (nonzero) digits is 2985984, while the sum is 51.

The spelling of 6401431694238 in words is "six trillion, four hundred one billion, four hundred thirty-one million, six hundred ninety-four thousand, two hundred thirty-eight".