67155800640 has 56 divisors (see below), whose sum is σ = 213219670080. Its totient is φ = 17908213248.

The previous prime is 67155800629. The next prime is 67155800641. The reversal of 67155800640 is 4600855176.

It is a junction number, because it is equal to n+sod(n) for n = 67155800592 and 67155800601.

It is not an unprimeable number, because it can be changed into a prime (67155800641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34976020 + ... + 34977939.

Almost surely, 2^67155800640 is an apocalyptic number.

67155800640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

67155800640 is an abundant number, since it is smaller than the sum of its proper divisors (146063869440).

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

67155800640 is a wasteful number, since it uses less digits than its factorization.

67155800640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69953979 (or 69953969 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The spelling of 67155800640 in words is "sixty-seven billion, one hundred fifty-five million, eight hundred thousand, six hundred forty".