67791571421 has 32 divisors (see below), whose sum is σ = 83278440960. Its totient is φ = 53916420096.

The previous prime is 67791571391. The next prime is 67791571423. The reversal of 67791571421 is 12417519776.

It is not a de Polignac number, because 67791571421 - 2³⁰ = 66717829597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 67791571421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67791571423) 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, 1990625 + ... + 2024393.

It is an arithmetic number, because the mean of its divisors is an integer number (2602451280).

Almost surely, 2^67791571421 is an apocalyptic number.

It is an amenable number.

67791571421 is a deficient number, since it is larger than the sum of its proper divisors (15486869539).

67791571421 is a wasteful number, since it uses less digits than its factorization.

67791571421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34173.

The product of its digits is 740880, while the sum is 50.

The spelling of 67791571421 in words is "sixty-seven billion, seven hundred ninety-one million, five hundred seventy-one thousand, four hundred twenty-one".