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31666687113 = 310555562371
BaseRepresentation
bin11101011111011110…
…110100110010001001
310000201220110101021110
4131133132310302021
51004323132441423
622314131000533
72200505253645
oct353736646211
9100656411243
1031666687113
11124800237a6
126179139149
132ca87797a9
14176593bc25
15c550ec193
hex75f7b4c89

31666687113 has 4 divisors (see below), whose sum is σ = 42222249488. Its totient is φ = 21111124740.

The previous prime is 31666687051. The next prime is 31666687153. The reversal of 31666687113 is 31178666613.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 31666687113 - 210 = 31666686089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31666687153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5277781183 + ... + 5277781188.

It is an arithmetic number, because the mean of its divisors is an integer number (10555562372).

Almost surely, 231666687113 is an apocalyptic number.

It is an amenable number.

31666687113 is a deficient number, since it is larger than the sum of its proper divisors (10555562375).

31666687113 is a wasteful number, since it uses less digits than its factorization.

31666687113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10555562374.

The product of its digits is 653184, while the sum is 48.

The spelling of 31666687113 in words is "thirty-one billion, six hundred sixty-six million, six hundred eighty-seven thousand, one hundred thirteen".

Divisors: 1 3 10555562371 31666687113