55405607 has 2 divisors, whose sum is σ = 55405608. Its totient is φ = 55405606.

The previous prime is 55405561. The next prime is 55405619. The reversal of 55405607 is 70650455.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55405607 - 2¹⁸ = 55143463 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55408607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27702803 + 27702804.

It is an arithmetic number, because the mean of its divisors is an integer number (27702804).

Almost surely, 2^55405607 is an apocalyptic number.

55405607 is a deficient number, since it is larger than the sum of its proper divisors (1).

55405607 is an equidigital number, since it uses as much as digits as its factorization.

55405607 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21000, while the sum is 32.

The square root of 55405607 is about 7443.4942735250. The cubic root of 55405607 is about 381.2278083652.

The spelling of 55405607 in words is "fifty-five million, four hundred five thousand, six hundred seven".