6404742327561 has 8 divisors (see below), whose sum is σ = 8834127348480. Its totient is φ = 4122592762512.

The previous prime is 6404742327559. The next prime is 6404742327563. The reversal of 6404742327561 is 1657232474046.

It is an interprime number because it is at equal distance from previous prime (6404742327559) and next prime (6404742327563).

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

It is not a de Polignac number, because 6404742327561 - 2¹ = 6404742327559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6404742327563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36808863865 + ... + 36808864038.

It is an arithmetic number, because the mean of its divisors is an integer number (1104265918560).

Almost surely, 2^{6404742327561} is an apocalyptic number.

It is an amenable number.

6404742327561 is a deficient number, since it is larger than the sum of its proper divisors (2429385020919).

6404742327561 is a wasteful number, since it uses less digits than its factorization.

6404742327561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73617727935.

The product of its (nonzero) digits is 6773760, while the sum is 51.

The spelling of 6404742327561 in words is "six trillion, four hundred four billion, seven hundred forty-two million, three hundred twenty-seven thousand, five hundred sixty-one".