6861091725 has 36 divisors (see below), whose sum is σ = 12550464576. Its totient is φ = 3581387040.

The previous prime is 6861091703. The next prime is 6861091747. The reversal of 6861091725 is 5271901686.

6861091725 is a `hidden beast` number, since 6 + 8 + 610 + 9 + 1 + 7 + 25 = 666.

It is an interprime number because it is at equal distance from previous prime (6861091703) and next prime (6861091747).

It is a de Polignac number, because none of the positive numbers 2^k-6861091725 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 313827 + ... + 334976.

It is an arithmetic number, because the mean of its divisors is an integer number (348624016).

Almost surely, 2^6861091725 is an apocalyptic number.

It is an amenable number.

6861091725 is a deficient number, since it is larger than the sum of its proper divisors (5689372851).

6861091725 is a wasteful number, since it uses less digits than its factorization.

6861091725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648866 (or 648858 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 6861091725 is about 82831.7072442673. The cubic root of 6861091725 is about 1900.1931221057.

The spelling of 6861091725 in words is "six billion, eight hundred sixty-one million, ninety-one thousand, seven hundred twenty-five".