681453615 has 16 divisors (see below), whose sum is σ = 1101568608. Its totient is φ = 359694336.

The previous prime is 681453593. The next prime is 681453649. The reversal of 681453615 is 516354186.

It is not a de Polignac number, because 681453615 - 2⁸ = 681453359 is a prime.

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, 232722 + ... + 235631.

It is an arithmetic number, because the mean of its divisors is an integer number (68848038).

Almost surely, 2^681453615 is an apocalyptic number.

681453615 is a deficient number, since it is larger than the sum of its proper divisors (420114993).

681453615 is a wasteful number, since it uses less digits than its factorization.

681453615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468458.

The product of its digits is 86400, while the sum is 39.

The square root of 681453615 is about 26104.6665368474. Note that the first 3 decimals coincide. The cubic root of 681453615 is about 879.9920862753.

The spelling of 681453615 in words is "six hundred eighty-one million, four hundred fifty-three thousand, six hundred fifteen".