55415567 has 2 divisors, whose sum is σ = 55415568. Its totient is φ = 55415566.

The previous prime is 55415557. The next prime is 55415587. The reversal of 55415567 is 76551455.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55415567 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55415567.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55415537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27707783 + 27707784.

It is an arithmetic number, because the mean of its divisors is an integer number (27707784).

Almost surely, 2^55415567 is an apocalyptic number.

55415567 is a deficient number, since it is larger than the sum of its proper divisors (1).

55415567 is an equidigital number, since it uses as much as digits as its factorization.

55415567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105000, while the sum is 38.

The square root of 55415567 is about 7444.1632840770. The cubic root of 55415567 is about 381.2506508275.

The spelling of 55415567 in words is "fifty-five million, four hundred fifteen thousand, five hundred sixty-seven".