2257981631906 has 96 divisors (see below), whose sum is σ = 4736396161728. Its totient is φ = 793175967360.

The previous prime is 2257981631897. The next prime is 2257981631909. The reversal of 2257981631906 is 6091361897522.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (2257981631909) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1270925 + ... + 2476128.

It is an arithmetic number, because the mean of its divisors is an integer number (49337460018).

Almost surely, 2^{2257981631906} is an apocalyptic number.

2257981631906 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

2257981631906 is an abundant number, since it is smaller than the sum of its proper divisors (2478414529822).

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

2257981631906 is a wasteful number, since it uses less digits than its factorization.

2257981631906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3747136 (or 3747129 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 59.

The spelling of 2257981631906 in words is "two trillion, two hundred fifty-seven billion, nine hundred eighty-one million, six hundred thirty-one thousand, nine hundred six".