681687148157 has 8 divisors (see below), whose sum is σ = 715585159296. Its totient is φ = 648144090352.

The previous prime is 681687148147. The next prime is 681687148213. The reversal of 681687148157 is 751841786186.

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

It is a cyclic number.

It is not a de Polignac number, because 681687148157 - 2⁸ = 681687147901 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 681687148157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681687148117) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88734398 + ... + 88742079.

It is an arithmetic number, because the mean of its divisors is an integer number (89448144912).

Almost surely, 2^681687148157 is an apocalyptic number.

It is an amenable number.

681687148157 is a deficient number, since it is larger than the sum of its proper divisors (33898011139).

681687148157 is a wasteful number, since it uses less digits than its factorization.

681687148157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177476667.

The product of its digits is 18063360, while the sum is 62.

The spelling of 681687148157 in words is "six hundred eighty-one billion, six hundred eighty-seven million, one hundred forty-eight thousand, one hundred fifty-seven".