681857471926 has 8 divisors (see below), whose sum is σ = 1026426017304. Its totient is φ = 339715466160.

The previous prime is 681857471909. The next prime is 681857471957. The reversal of 681857471926 is 629174758186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×681857471926² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 606634200 + ... + 606635323.

It is an arithmetic number, because the mean of its divisors is an integer number (128303252163).

Almost surely, 2^681857471926 is an apocalyptic number.

681857471926 is a deficient number, since it is larger than the sum of its proper divisors (344568545378).

681857471926 is a wasteful number, since it uses less digits than its factorization.

681857471926 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1213269806.

The product of its digits is 40642560, while the sum is 64.

The spelling of 681857471926 in words is "six hundred eighty-one billion, eight hundred fifty-seven million, four hundred seventy-one thousand, nine hundred twenty-six".