6921861460757 has 4 divisors (see below), whose sum is σ = 7329029781996. Its totient is φ = 6514693139520.

The previous prime is 6921861460729. The next prime is 6921861460781. The reversal of 6921861460757 is 7570641681296.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3629211692401 + 3292649768356 = 1905049^2 + 1814566^2 .

It is a cyclic number.

It is not a de Polignac number, because 6921861460757 - 2²⁶ = 6921794351893 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 6921861460757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6921861460957) 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, 203584160594 + ... + 203584160627.

It is an arithmetic number, because the mean of its divisors is an integer number (1832257445499).

Almost surely, 2^{6921861460757} is an apocalyptic number.

It is an amenable number.

6921861460757 is a deficient number, since it is larger than the sum of its proper divisors (407168321239).

6921861460757 is a wasteful number, since it uses less digits than its factorization.

6921861460757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407168321238.

The product of its (nonzero) digits is 30481920, while the sum is 62.

The spelling of 6921861460757 in words is "six trillion, nine hundred twenty-one billion, eight hundred sixty-one million, four hundred sixty thousand, seven hundred fifty-seven".