133687656465 has 32 divisors (see below), whose sum is σ = 235274239872. Its totient is φ = 64818248000.

The previous prime is 133687656461. The next prime is 133687656517. The reversal of 133687656465 is 564656786331.

It is not a de Polignac number, because 133687656465 - 2² = 133687656461 is a prime.

It is a super-2 number, since 2×133687656465² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 133687656399 and 133687656408.

It is not an unprimeable number, because it can be changed into a prime (133687656461) 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, 3328086 + ... + 3368015.

It is an arithmetic number, because the mean of its divisors is an integer number (7352319996).

Almost surely, 2^133687656465 is an apocalyptic number.

133687656465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

133687656465 is a deficient number, since it is larger than the sum of its proper divisors (101586583407).

133687656465 is an equidigital number, since it uses as much as digits as its factorization.

133687656465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6696142 (or 6696120 counting only the distinct ones).

The product of its digits is 65318400, while the sum is 60.

The spelling of 133687656465 in words is "one hundred thirty-three billion, six hundred eighty-seven million, six hundred fifty-six thousand, four hundred sixty-five".