6423651125561 has 4 divisors (see below), whose sum is σ = 6427129011072. Its totient is φ = 6420173240052.

The previous prime is 6423651125513. The next prime is 6423651125603. The reversal of 6423651125561 is 1655211563246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6423651125561 - 2³⁸ = 6148773218617 is a prime.

It is a super-2 number, since 2×6423651125561² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6423651175561) 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, 1738939985 + ... + 1738943678.

It is an arithmetic number, because the mean of its divisors is an integer number (1606782252768).

Almost surely, 2^{6423651125561} is an apocalyptic number.

It is an amenable number.

6423651125561 is a deficient number, since it is larger than the sum of its proper divisors (3477885511).

6423651125561 is a wasteful number, since it uses less digits than its factorization.

6423651125561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3477885510.

The product of its digits is 1296000, while the sum is 47.

The spelling of 6423651125561 in words is "six trillion, four hundred twenty-three billion, six hundred fifty-one million, one hundred twenty-five thousand, five hundred sixty-one".