6420154456551 has 16 divisors (see below), whose sum is σ = 9887724511488. Its totient is φ = 3662120188800.

The previous prime is 6420154456543. The next prime is 6420154456559. The reversal of 6420154456551 is 1556544510246.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6420154456543) and next prime (6420154456559).

It is not a de Polignac number, because 6420154456551 - 2³ = 6420154456543 is a prime.

It is a super-2 number, since 2×6420154456551² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6420154456551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420154456559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5722062235 + ... + 5722063356.

It is an arithmetic number, because the mean of its divisors is an integer number (617982781968).

Almost surely, 2^{6420154456551} is an apocalyptic number.

6420154456551 is a deficient number, since it is larger than the sum of its proper divisors (3467570054937).

6420154456551 is a wasteful number, since it uses less digits than its factorization.

6420154456551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11444125622.

The product of its (nonzero) digits is 2880000, while the sum is 48.

Adding to 6420154456551 its reverse (1556544510246), we get a palindrome (7976698966797).

The spelling of 6420154456551 in words is "six trillion, four hundred twenty billion, one hundred fifty-four million, four hundred fifty-six thousand, five hundred fifty-one".