681155756 has 6 divisors (see below), whose sum is σ = 1192022580. Its totient is φ = 340577876.

The previous prime is 681155743. The next prime is 681155771. The reversal of 681155756 is 657551186.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85144466 + ... + 85144473.

It is an arithmetic number, because the mean of its divisors is an integer number (198670430).

Almost surely, 2^681155756 is an apocalyptic number.

It is an amenable number.

681155756 is a deficient number, since it is larger than the sum of its proper divisors (510866824).

681155756 is a wasteful number, since it uses less digits than its factorization.

681155756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170288943 (or 170288941 counting only the distinct ones).

The product of its digits is 252000, while the sum is 44.

The square root of 681155756 is about 26098.9608222243. The cubic root of 681155756 is about 879.8638546267.

The spelling of 681155756 in words is "six hundred eighty-one million, one hundred fifty-five thousand, seven hundred fifty-six".