681475742501 has 4 divisors (see below), whose sum is σ = 695975226432. Its totient is φ = 666976258572.

The previous prime is 681475742489. The next prime is 681475742509. The reversal of 681475742501 is 105247574186.

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.

It is a cyclic number.

It is not a de Polignac number, because 681475742501 - 2¹⁰ = 681475741477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681475742501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681475742509) 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, 7249741895 + ... + 7249741988.

It is an arithmetic number, because the mean of its divisors is an integer number (173993806608).

Almost surely, 2^681475742501 is an apocalyptic number.

It is an amenable number.

681475742501 is a deficient number, since it is larger than the sum of its proper divisors (14499483931).

681475742501 is a wasteful number, since it uses less digits than its factorization.

681475742501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14499483930.

The product of its (nonzero) digits is 1881600, while the sum is 50.

The spelling of 681475742501 in words is "six hundred eighty-one billion, four hundred seventy-five million, seven hundred forty-two thousand, five hundred one".