681355534201 has 4 divisors (see below), whose sum is σ = 682710118272. Its totient is φ = 680000950132.

The previous prime is 681355534199. The next prime is 681355534231. The reversal of 681355534201 is 102435553186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 102435553186 = 2 ⋅51217776593.

It is a cyclic number.

It is not a de Polignac number, because 681355534201 - 2¹ = 681355534199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681355534231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677291281 + ... + 677292286.

It is an arithmetic number, because the mean of its divisors is an integer number (170677529568).

Almost surely, 2^681355534201 is an apocalyptic number.

It is an amenable number.

681355534201 is a deficient number, since it is larger than the sum of its proper divisors (1354584071).

681355534201 is a wasteful number, since it uses less digits than its factorization.

681355534201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1354584070.

The product of its (nonzero) digits is 432000, while the sum is 43.

The spelling of 681355534201 in words is "six hundred eighty-one billion, three hundred fifty-five million, five hundred thirty-four thousand, two hundred one".