6521400794651 has 4 divisors (see below), whose sum is σ = 6531296699400. Its totient is φ = 6511504889904.

The previous prime is 6521400794593. The next prime is 6521400794663. The reversal of 6521400794651 is 1564970041256.

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

It is a cyclic number.

It is not a de Polignac number, because 6521400794651 - 2¹⁴ = 6521400778267 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 6521400794651.

It is not an unprimeable number, because it can be changed into a prime (6521400793651) 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, 4947951386 + ... + 4947952703.

It is an arithmetic number, because the mean of its divisors is an integer number (1632824174850).

Almost surely, 2^{6521400794651} is an apocalyptic number.

6521400794651 is a deficient number, since it is larger than the sum of its proper divisors (9895904749).

6521400794651 is an equidigital number, since it uses as much as digits as its factorization.

6521400794651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9895904748.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 6521400794651 in words is "six trillion, five hundred twenty-one billion, four hundred million, seven hundred ninety-four thousand, six hundred fifty-one".