54640440551 has 4 divisors (see below), whose sum is σ = 54725418552. Its totient is φ = 54555462552.

The previous prime is 54640440541. The next prime is 54640440557. The reversal of 54640440551 is 15504404645.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15504404645 = 5 ⋅3100880929.

It is a cyclic number.

It is not a de Polignac number, because 54640440551 - 2³⁴ = 37460571367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54640440557) 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, 42488036 + ... + 42489321.

It is an arithmetic number, because the mean of its divisors is an integer number (13681354638).

Almost surely, 2^54640440551 is an apocalyptic number.

54640440551 is a deficient number, since it is larger than the sum of its proper divisors (84978001).

54640440551 is an equidigital number, since it uses as much as digits as its factorization.

54640440551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84978000.

The product of its (nonzero) digits is 192000, while the sum is 38.

The spelling of 54640440551 in words is "fifty-four billion, six hundred forty million, four hundred forty thousand, five hundred fifty-one".