681701977 has 8 divisors (see below), whose sum is σ = 745498080. Its totient is φ = 618209760.

The previous prime is 681701971. The next prime is 681701983. The reversal of 681701977 is 779107186.

It is an interprime number because it is at equal distance from previous prime (681701971) and next prime (681701983).

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 681701977 - 2¹¹ = 681699929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681701971) 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, 71263 + ... + 80260.

It is an arithmetic number, because the mean of its divisors is an integer number (93187260).

Almost surely, 2^681701977 is an apocalyptic number.

It is an amenable number.

681701977 is a deficient number, since it is larger than the sum of its proper divisors (63796103).

681701977 is a wasteful number, since it uses less digits than its factorization.

681701977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151943.

The product of its (nonzero) digits is 148176, while the sum is 46.

The square root of 681701977 is about 26109.4231456767. The cubic root of 681701977 is about 880.0989803438.

The spelling of 681701977 in words is "six hundred eighty-one million, seven hundred one thousand, nine hundred seventy-seven".