67719840957 has 6 divisors (see below), whose sum is σ = 97817548062. Its totient is φ = 45146560632.

The previous prime is 67719840949. The next prime is 67719840977. The reversal of 67719840957 is 75904891776.

It can be written as a sum of positive squares in only one way, i.e., 38280487716 + 29439353241 = 195654^2 + 171579^2 .

It is not a de Polignac number, because 67719840957 - 2³ = 67719840949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 67719840894 and 67719840903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67719840977) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3762213378 + ... + 3762213395.

It is an arithmetic number, because the mean of its divisors is an integer number (16302924677).

Almost surely, 2^67719840957 is an apocalyptic number.

It is an amenable number.

67719840957 is a deficient number, since it is larger than the sum of its proper divisors (30097707105).

67719840957 is a wasteful number, since it uses less digits than its factorization.

67719840957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7524426779 (or 7524426776 counting only the distinct ones).

The product of its (nonzero) digits is 26671680, while the sum is 63.

The spelling of 67719840957 in words is "sixty-seven billion, seven hundred nineteen million, eight hundred forty thousand, nine hundred fifty-seven".