55404400551 has 16 divisors (see below), whose sum is σ = 75472439808. Its totient is φ = 36136900800.

The previous prime is 55404400549. The next prime is 55404400567. The reversal of 55404400551 is 15500440455.

It is not a de Polignac number, because 55404400551 - 2¹ = 55404400549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55404440551) 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, 313131 + ... + 457011.

It is an arithmetic number, because the mean of its divisors is an integer number (4717027488).

Almost surely, 2^55404400551 is an apocalyptic number.

55404400551 is a deficient number, since it is larger than the sum of its proper divisors (20068039257).

55404400551 is a wasteful number, since it uses less digits than its factorization.

55404400551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146662.

The product of its (nonzero) digits is 40000, while the sum is 33.

The spelling of 55404400551 in words is "fifty-five billion, four hundred four million, four hundred thousand, five hundred fifty-one".