31998718622340 has 144 divisors (see below), whose sum is σ = 102774708271872. Its totient is φ = 8030867063808.

The previous prime is 31998718622303. The next prime is 31998718622341. The reversal of 31998718622340 is 4322681789913.

31998718622340 is a `hidden beast` number, since 3 + 1 + 9 + 98 + 7 + 186 + 22 + 340 = 666.

It is not an unprimeable number, because it can be changed into a prime (31998718622341) 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, 175758037 + ... + 175940003.

It is an arithmetic number, because the mean of its divisors is an integer number (713713251888).

Almost surely, 2^{31998718622340} is an apocalyptic number.

31998718622340 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31998718622340 is an abundant number, since it is smaller than the sum of its proper divisors (70775989649532).

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

31998718622340 is a wasteful number, since it uses less digits than its factorization.

31998718622340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239466 (or 239461 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 63.

The spelling of 31998718622340 in words is "thirty-one trillion, nine hundred ninety-eight billion, seven hundred eighteen million, six hundred twenty-two thousand, three hundred forty".