67530121820 has 48 divisors (see below), whose sum is σ = 162339502080. Its totient is φ = 23115011904.

The previous prime is 67530121811. The next prime is 67530121871. The reversal of 67530121820 is 2812103576.

It is a happy number.

It is a super-2 number, since 2×67530121820² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312350 + ... + 482309.

It is an arithmetic number, because the mean of its divisors is an integer number (3382072960).

Almost surely, 2^67530121820 is an apocalyptic number.

It is an amenable number.

67530121820 is an abundant number, since it is smaller than the sum of its proper divisors (94809380260).

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

67530121820 is a wasteful number, since it uses less digits than its factorization.

67530121820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795282 (or 795280 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 67530121820 in words is "sixty-seven billion, five hundred thirty million, one hundred twenty-one thousand, eight hundred twenty".